#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>

using namespace std;
//total: 存在妈妈那里的总钱数；
//remain: 津津当前剩在自己手里的钱数；
//cur：读入的值，表示当前这个月的生活开销；
int main()
{
    int total = 0, remain = 0;
    for (int i = 1; i <= 12; i ++ )
    {
        int cur;
        cin >> cur;
        if (remain + 300 < cur)
        {
            total = -i;
            break;
        }
        total = total + (remain - cur + 300) / 100 * 120;
        remain = (remain - cur + 300) % 100;

    }
    if(total > 0) total += remain;
    cout << total << endl;

    return 0;
}