@@ -0,0 +1,56 @@
+package backjoon;
+// https://www.acmicpc.net/problem/2798
+// 블랙잭
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.StringTokenizer;
+
+public class _2798 {
+  public static void main(String[] args) throws IOException {
+    // memory 11592 runtime 96
+    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+    StringTokenizer st = new StringTokenizer(br.readLine(), " ");
+    int N = Integer.parseInt(st.nextToken());
+    int M = Integer.parseInt(st.nextToken());
+
+    st = new StringTokenizer(br.readLine(), " ");
+    int[] arr = new int[N];
+    for(int i=0; i<arr.length; i++){
+      arr[i] = Integer.parseInt(st.nextToken());
+    }
+
+    int sum = findSum(arr, N, M);
+    System.out.println(sum);
+  }
+
+  static int findSum(int[] arr, int N, int M){
+    int sum = 0;
+    for(int i=0; i<N-2; i++){
+      for(int j=i+1; j<N-1; j++){
+        for(int k=j+1; k<N; k++){
+          int tempSum = arr[i]+arr[j]+arr[k];
+          if(tempSum == M){
+            return tempSum;
+          }
+          // 세 카드의 합 sum이 이전 합 tempSum보다 크면서 M 보다 작을 경우
+          if(sum < tempSum && tempSum < M) {
+            sum = tempSum;
+          }
+        }
+      }
+    }
+    return sum;
+  }
+}
+/*
+INPUT
+5 21
+5 6 7 8 9
+
+5 9
+1 2 4 3 5
+
+OUTPUT
+21
+ */