diff --git a/week6/KBC/boj_1915.java b/week6/KBC/boj_1915.java
new file mode 100644
index 0000000..0068b2d
--- /dev/null
+++ b/week6/KBC/boj_1915.java
@@ -0,0 +1,34 @@
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class Main {
+    static int height;
+    static int width;
+    static int[][] map;
+
+    public static void main(String[] args) throws IOException {
+        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+        String[] input = br.readLine().split(" ");
+        height = Integer.parseInt(input[0]);
+        width = Integer.parseInt(input[1]);
+        map = new int[height + 1][width + 1];
+        for (int h = 1; h <= height; h++) {
+            input = br.readLine().split("");
+            for (int w = 1; w <= width; w++) {
+                map[h][w] = Integer.parseInt(input[w - 1]);
+            }
+        }
+
+        int max = 0;
+        for (int h = 1; h <= height; h++) {
+            for (int w = 1; w <= width; w++) {
+                if (map[h][w] >= 1 && map[h][w - 1] >= 1 && map[h - 1][w] >= 1 && map[h - 1][w - 1] >= 1) {
+                    map[h][w] = Math.min(map[h][w - 1], Math.min(map[h - 1][w], map[h-1][w-1])) + 1;
+                }
+                max = Math.max(map[h][w], max);
+            }
+        }
+        System.out.println(max * max);
+    }
+}