题解 | 牛牛是否被叫家长

#include <iostream>
using namespace std;
int main()
{
    int a,b,c;
    cin>>a>>b>>c;
    double ave;
    ave=(a+b+c)/3;
    if(ave>=60){
        cout<<"NO"<<endl;
    }else{
        cout<<"YES"<<endl;
    }
    return 0;
}