diff --git a/manifest.toml b/manifest.toml
index 8961bc3..f28dbf0 100644
--- a/manifest.toml
+++ b/manifest.toml
@@ -4,11 +4,14 @@
 packages = [
   { name = "argv", version = "1.0.2", build_tools = ["gleam"], requirements = [], otp_app = "argv", source = "hex", outer_checksum = "BA1FF0929525DEBA1CE67256E5ADF77A7CDDFE729E3E3F57A5BDCAA031DED09D" },
   { name = "decode", version = "0.5.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "decode", source = "hex", outer_checksum = "05E14DC95A550BA51B8774485B04894B87A898C588B9B1C920104B110AED218B" },
+  { name = "envoy", version = "1.0.2", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "envoy", source = "hex", outer_checksum = "95FD059345AA982E89A0B6E2A3BF1CF43E17A7048DCD85B5B65D3B9E4E39D359" },
   { name = "filepath", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "filepath", source = "hex", outer_checksum = "67A6D15FB39EEB69DD31F8C145BB5A421790581BD6AA14B33D64D5A55DBD6587" },
-  { name = "gladvent", version = "2.0.2", build_tools = ["gleam"], requirements = ["argv", "decode", "filepath", "gleam_erlang", "gleam_json", "gleam_otp", "gleam_package_interface", "gleam_stdlib", "glint", "parallel_map", "shellout", "simplifile", "snag", "spinner", "tom"], otp_app = "gladvent", source = "hex", outer_checksum = "1EDAF931C73B0E65C209B5F5745C540637FFCF8322BBA90000C5BC4C63DA7C70" },
+  { name = "gladvent", version = "2.1.0", build_tools = ["gleam"], requirements = ["argv", "decode", "envoy", "filepath", "gleam_erlang", "gleam_http", "gleam_httpc", "gleam_json", "gleam_otp", "gleam_package_interface", "gleam_stdlib", "glint", "parallel_map", "shellout", "simplifile", "snag", "spinner", "tom"], otp_app = "gladvent", source = "hex", outer_checksum = "50E05A8AA03F9EAACE2F44333927975754C3895B0F7A4EE48B3A125B358D30E7" },
   { name = "gleam_community_ansi", version = "1.4.1", build_tools = ["gleam"], requirements = ["gleam_community_colour", "gleam_stdlib"], otp_app = "gleam_community_ansi", source = "hex", outer_checksum = "4CD513FC62523053E62ED7BAC2F36136EC17D6A8942728250A9A00A15E340E4B" },
   { name = "gleam_community_colour", version = "1.4.1", build_tools = ["gleam"], requirements = ["gleam_json", "gleam_stdlib"], otp_app = "gleam_community_colour", source = "hex", outer_checksum = "386CB9B01B33371538672EEA8A6375A0A0ADEF41F17C86DDCB81C92AD00DA610" },
-  { name = "gleam_erlang", version = "0.32.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "B18643083A0117AC5CFD0C1AEEBE5469071895ECFA426DCC26517A07F6AD9948" },
+  { name = "gleam_erlang", version = "0.33.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_erlang", source = "hex", outer_checksum = "A1D26B80F01901B59AABEE3475DD4C18D27D58FA5C897D922FCB9B099749C064" },
+  { name = "gleam_http", version = "3.7.1", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_http", source = "hex", outer_checksum = "A9EE0722106FCCAB8AD3BF9D0A3EFF92BFE8561D59B83BAE96EB0BE1938D4E0F" },
+  { name = "gleam_httpc", version = "4.0.0", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_http", "gleam_stdlib"], otp_app = "gleam_httpc", source = "hex", outer_checksum = "76FEEC99473E568EBA34336A37CF3D54629ACE77712950DC9BB097B5FD664664" },
   { name = "gleam_json", version = "2.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "gleam_json", source = "hex", outer_checksum = "0A57FB5666E695FD2BEE74C0428A98B0FC11A395D2C7B4CDF5E22C5DD32C74C6" },
   { name = "gleam_otp", version = "0.14.1", build_tools = ["gleam"], requirements = ["gleam_erlang", "gleam_stdlib"], otp_app = "gleam_otp", source = "hex", outer_checksum = "5A8CE8DBD01C29403390A7BD5C0A63D26F865C83173CF9708E6E827E53159C65" },
   { name = "gleam_package_interface", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_json", "gleam_stdlib"], otp_app = "gleam_package_interface", source = "hex", outer_checksum = "CF3BFC5D0997750D9550D8D73A90F4B8D71C6C081B20ED4E70FFBE1E99AFC3C2" },
@@ -22,7 +25,7 @@ packages = [
   { name = "shellout", version = "1.6.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "shellout", source = "hex", outer_checksum = "E2FCD18957F0E9F67E1F497FC9FF57393392F8A9BAEAEA4779541DE7A68DD7E0" },
   { name = "simplifile", version = "2.2.0", build_tools = ["gleam"], requirements = ["filepath", "gleam_stdlib"], otp_app = "simplifile", source = "hex", outer_checksum = "0DFABEF7DC7A9E2FF4BB27B108034E60C81BEBFCB7AB816B9E7E18ED4503ACD8" },
   { name = "snag", version = "1.0.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "snag", source = "hex", outer_checksum = "08E9EB87C413457DB1DD66CD704C6878DACC9C93B418600F63873D0CD224E756" },
-  { name = "spinner", version = "1.2.0", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib", "glearray", "repeatedly"], otp_app = "spinner", source = "hex", outer_checksum = "9EE43AA33BE2DA5731B8F3F170AAB59AF1A815AFA5BF615F12C1B91F3B03F157" },
+  { name = "spinner", version = "1.3.0", build_tools = ["gleam"], requirements = ["gleam_community_ansi", "gleam_stdlib", "glearray", "repeatedly"], otp_app = "spinner", source = "hex", outer_checksum = "B824C4CFDA6AC912D14365BF365F2A52C4DA63EF2D768D2A1C46D9BF7AF669E7" },
   { name = "tom", version = "1.1.0", build_tools = ["gleam"], requirements = ["gleam_stdlib"], otp_app = "tom", source = "hex", outer_checksum = "228E667239504B57AD05EC3C332C930391592F6C974D0EFECF32FFD0F3629A27" },
 ]
 
diff --git a/src/aoc_2024/day_7.gleam b/src/aoc_2024/day_7.gleam
new file mode 100644
index 0000000..76903b6
--- /dev/null
+++ b/src/aoc_2024/day_7.gleam
@@ -0,0 +1,88 @@
+import extra
+import gleam/int
+import gleam/list
+import gleam/order
+import gleam/string
+
+pub type Row {
+  Row(result: Int, operands: List(Int))
+}
+
+pub fn parse(input: String) -> List(Row) {
+  string.split(input, "\n")
+  |> list.map(fn(line) {
+    case string.split(line, ": ") {
+      [result_str, operands_str] -> {
+        Row(
+          result: extra.yolo_int(result_str),
+          operands: string.split(operands_str, " ")
+            |> list.map(extra.yolo_int),
+        )
+      }
+      _ -> panic as "Bad input 1"
+    }
+  })
+}
+
+pub fn pt_1(input: List(Row)) {
+  input
+  |> list.filter(fn(row) { can_be_combined(row, [int.add, int.multiply]) })
+  |> list.map(fn(row) { row.result })
+  |> int.sum
+}
+
+pub fn pt_2(input: List(Row)) {
+  input
+  |> list.filter(fn(row) {
+    can_be_combined(row, [int.add, int.multiply, concat_digits])
+  })
+  |> list.map(fn(row) { row.result })
+  |> int.sum
+}
+
+fn can_be_combined(row: Row, ops: List(fn(Int, Int) -> Int)) -> Bool {
+  case row.operands {
+    [first, ..rest] -> search(row.result, [#(first, rest)], ops)
+    _ -> panic as "No operands?!"
+  }
+}
+
+fn concat_digits(a: Int, b: Int) -> Int {
+  // TODO could be faster if we do math (a * log10(b) + b)
+  extra.yolo_int(int.to_string(a) <> int.to_string(b))
+}
+
+fn search(
+  result: Int,
+  todos: List(#(Int, List(Int))),
+  ops: List(fn(Int, Int) -> Int),
+) -> Bool {
+  case todos {
+    [] -> False
+    [#(acc_sum, operands), ..rest_of_todos] -> {
+      case operands {
+        [] ->
+          case acc_sum == result {
+            True -> True
+            False -> search(result, rest_of_todos, ops)
+          }
+        [operand, ..rest_of_operands] -> {
+          case acc_sum > result {
+            True -> search(result, rest_of_todos, ops)
+            False ->
+              search(
+                result,
+                list.append(
+                  list.map(ops, fn(op) {
+                    #(op(acc_sum, operand), rest_of_operands)
+                  }),
+                  rest_of_todos,
+                ),
+                ops,
+              )
+          }
+        }
+      }
+    }
+  }
+}