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