@@ -0,0 +1,31 @@
+package TIL;
+
+import java.io.*;
+
+
+public class J13300_1 {
+    public static void main(String[] args) throws IOException {
+        BufferedReader buffer = new BufferedReader(new InputStreamReader(System.in));
+
+        String[] input = buffer.readLine().split(" ");
+
+        int N = Integer.parseInt(input[0]);
+        int K = Integer.parseInt(input[1]);
+
+        int[][] arr = new int[2][7];
+
+        for(int i = 1 ; i<N+1; i++){
+            input = buffer.readLine().split(" ");
+            int s = Integer.parseInt(input[0]);
+            int g = Integer.parseInt(input[1]);
+
+            arr[s][g]++;
+        }
+        int cnt = 0;
+        int room = 0;
+        for(int i = 1; i <= N; i++){
+            cnt += arr[0][i];
+        }
+        System.out.println(room);
+    }
+}