题解 | 牛牛是否被叫家长

import java.util.*;
public class Main{
    public static void main(String[] args){
        int a,b,c;
        Scanner scan = new Scanner(System.in);
        a = scan.nextInt();
        b = scan.nextInt();
        c = scan.nextInt();
        int avg = (a+b+c)/3;
        if(avg>=60)System.out.println("NO");
        else System.out.println("YES");
    }
}