#include<bits/stdc++.h>
using namespace std;
int sum/*手头多少💴*/,cun/*存了多少💴*/,ji/*计划*/;
int main(){
    for(int i=1;i<=12;i++){
        cin>>ji;
        sum+=300;
        if(sum<ji){
            cout<<'-'<<i;
            return 0;
        }
        sum-=ji;
        if(sum>=100){
            int x=(sum)%100;
            sum-=x*100;
            cun+=x*100;
        }
        
    }
    cout<<sum+cun*1.2;
    return 0;
}