666

#include <bits/stdc++.h>
using namespace std;
int main()
{
    int x,sum=0,ma=0,a,b=0;
    for(int i=1;i<=12;i++)
    {
        cin>>x;
        sum+=300;
        sum-=x;
        if(sum<0)
        {
            cout<<i*-1;
            return 0;
        }
        a=sum/100;
        ma+=a*100;
        sum-=a*100;
    }
    b=sum+ma*1.2;
    cout<<b;
    return 0;
}