#include<iostream>
using namespace std;
int main(){
int m[13];
while(cin>>m[1]){
int sum=0,end=300,mon=0;
end-=m[1];
if(end<0) mon=-1;
else if(end>=100) 
while(end>=100) {sum+=100; end-=100;}
for(int i=2; i<=12; i++){
cin>>m[i];
if(mon!=0) continue;
end+=300;
end-=m[i];
if(end<0) mon=-i;
else if(end>=100)
while(end>=100) {sum+=100; end-=100;}
}
if(mon!=0) cout<<mon<<endl;
else cout<<end+sum*1.2<<endl;
cout<<endl;
}
}