diff --git a/UniquePathII/step1.md b/UniquePathII/step1.md
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+```java
+class Solution {
+    public int uniquePathsWithObstacles(int[][] grid) {
+        int m = grid.length;
+        int n = grid[0].length;
+        int[][] dp = new int[m][n];
+
+        for (int y = 0; y < m; y++) {
+            for (int x = 0; x < n; x++) {
+                if (grid[y][x] == 1) {
+                    continue;
+                }
+                if (x == 0 && y == 0) {
+                    dp[y][x] = 1;
+                    continue;
+                }
+
+                if (x == 0) {
+                    dp[y][x] = dp[y - 1][x];
+                    continue;
+                }
+
+                if (y == 0) {
+                    dp[y][x] = dp[y][x - 1];
+                    continue;
+                }
+                
+                dp[y][x] = dp[y - 1][x] + dp[y][x - 1];
+            }
+        }
+
+        return dp[m - 1][n - 1];
+    }
+}
+```