2475 검증수

 

 

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


public class Main {
	
 public static void main(String[] args) throws IOException {
	 BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	 StringTokenizer st = new StringTokenizer(br.readLine(), " ");
	 int sum = 0;
	 for(int i =0; i<5; i++) {
		 int a = Integer.parseInt(st.nextToken());
		 sum += Math.pow(a, 2);
	 }
	 System.out.println(sum%10);
 }
}