diff --git "a/10844_\354\211\254\354\232\264\352\263\204\353\213\250\354\210\230/stairs.cpp" "b/10844_\354\211\254\354\232\264\352\263\204\353\213\250\354\210\230/stairs.cpp"
index 8347c7c..c001079 100644
--- "a/10844_\354\211\254\354\232\264\352\263\204\353\213\250\354\210\230/stairs.cpp"
+++ "b/10844_\354\211\254\354\232\264\352\263\204\353\213\250\354\210\230/stairs.cpp"
@@ -3,35 +3,41 @@
 2018 Jan 17, made by Jeon
 
 */
+
 #include <cstdio>
+
 int main(void)
 {
- long long gds[101][10] = { 0 };
- long long res = 0;
- int N;
- scanf("%d", &N);
- for (int i = 1; i <= 9; i++)
-  gds[1][i] = 1;
- for (int i = 2; i <= N; i++)
- {
-  gds[i][0] = gds[i - 1][1];
-  gds[i][1] = gds[i - 1][2] + gds[i - 1][0];
-  gds[i][2] = gds[i - 1][3] + gds[i - 1][1];
-  gds[i][3] = gds[i - 1][4] + gds[i - 1][2];
-  gds[i][4] = gds[i - 1][5] + gds[i - 1][3];
-  gds[i][5] = gds[i - 1][6] + gds[i - 1][4];
-  gds[i][6] = gds[i - 1][7] + gds[i - 1][5];
-  gds[i][7] = gds[i - 1][8] + gds[i - 1][6];
-  gds[i][8] = gds[i - 1][9] + gds[i - 1][7];
-  gds[i][9] = gds[i - 1][8];
-  for (int j = 0; j <= 9; j++)
-   gds[i][j] %= 1000000000;
- }
- for (int i = 0; i <= 9; i++)
- {
-  res += gds[N][i];
-  res %= 1000000000;
- }
- printf("%lld\n", res);
- return 0;
-} 
\ No newline at end of file
+  long long gds[101][10] = { 0 };
+  long long res = 0;
+  int N;
+  scanf("%d", &N);
+ 
+  for (int i = 1; i <= 9; i++)
+    gds[1][i] = 1;
+ 
+  for (int i = 2; i <= N; i++)
+  {
+    gds[i][0] = gds[i - 1][1];
+    gds[i][1] = gds[i - 1][2] + gds[i - 1][0];
+    gds[i][2] = gds[i - 1][3] + gds[i - 1][1];
+    gds[i][3] = gds[i - 1][4] + gds[i - 1][2];
+    gds[i][4] = gds[i - 1][5] + gds[i - 1][3];
+    gds[i][5] = gds[i - 1][6] + gds[i - 1][4];
+    gds[i][6] = gds[i - 1][7] + gds[i - 1][5];
+    gds[i][7] = gds[i - 1][8] + gds[i - 1][6];
+    gds[i][8] = gds[i - 1][9] + gds[i - 1][7];
+    gds[i][9] = gds[i - 1][8];
+    for (int j = 0; j <= 9; j++)
+    gds[i][j] %= 1000000000;
+  }
+ 
+  for (int i = 0; i <= 9; i++)
+  {
+    res += gds[N][i];
+    res %= 1000000000;
+  }
+ 
+  printf("%lld\n", res);
+  return 0;
+}