#include <iostream>
using namespace std;
int main(){
long p,a,r =0,sum=0;
for(int i=0;i<12;i++){
r = r + 300;
cin >> p;
r = r - p;
a = r/100;
sum = sum + a * 100;
r = r - a * 100;
if (r<0){
cout << "-" << i+1 << endl;
break;
}
}
if (r>0)
cout << sum * 1.2 + r << endl;
return 0;
}