diff --git a/argorithm/123add_dp_practice.py b/argorithm/123add_dp_practice.py
new file mode 100644
index 0000000..001737d
--- /dev/null
+++ b/argorithm/123add_dp_practice.py
@@ -0,0 +1,10 @@
+import sys
+
+T = int(sys.stdin.readline())
+
+dq = [0, 1, 2, 4]
+for _ in range(T):
+    n = int(sys.stdin.readline())
+    for i in range(len(dq), n+1):
+        dq.append(dq[i-1]+dq[i-2]+dq[i-3])
+    print(dq[n])
\ No newline at end of file