백준 2475

package baekjoon.구현;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

class Main2475 {

   public static void main(String[] args) throws Exception {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      StringTokenizer st = new StringTokenizer(br.readLine());
      int ans = 0;
      for (int i = 0; i < 5; i++) {
         int tmp = Integer.parseInt(st.nextToken());
         ans += tmp * tmp;
      }
      ans %= 10;
      System.out.println(ans);

   }
}