#55513: c++ ezpass
#include <bits/stdc++.h>
using namespace std;
int main(){
int t,grade,total=0;
while(cin>>t){
total=0;
for(int i=0;i<t;i++){
cin>>grade;
total+=grade;
}
cout<<(total<=59*t ? "yes":"no")<<endl;}
return 0;
}