#include<bits/stdc++.h>
using namespace std;

int main() {
    int budget, money = 0, interest = 0;
    for (int i = 1; i <= 12; i++) {
        cin >> budget;
        money += 300 - budget;
        if (money < 0) {
            cout << '-' << i;
            return 0;
        }
        while (money >= 100) {
            interest += 100;
            money -= 100;
        }
    }
    cout << money + interest * 1.2;
    return 0;
}

#include <iostream>
using namespace std;
int main(){
	int d,y,c=0,l=0;
	for(int i=1;i<=12;i++){
	    cin>>d;
	    y=l+300-d;
	    c=c+y/100;
	    l=y%100;
	    if(y<0){
	        cout<<-i;
	        return 0;
	    }	
	}
	cout<<c*100*1.2+l<<endl;
	return 0;
}