hi

#include <iostream>
using namespace std;

int main()
{
int z, c;
z = 0;
c = 0;
for (int i = 1; i <= 12; ++i)
{
int n, v;
cin >> n;
v = 300 - n;
if (300 + c < n)
{
cout << -i;
return 0;
}
c += v % 100;
if (c >= 100)
{
c -= 100;
v += 100;
}
v = v - v % 100;
z += v;
}
z += z * 0.2;
cout << z + c;
return 0;
}