#include

using namespace std;

int main() {

int a=0, b=0,c[12],d;
for (int i = 0; i < 12; i++) {
	cin >> c[i];}
for (int k = 0; k < 12; k++) {
	a = a + 300 - c[k];
	if (a <=-1) { cout << '-' << k + 1<<endl; break; }
	if (100 <= a < 200) { a -= 100; b += 100; }
	if (200 <= a < 300) { a -= 200; b += 200; }
	if (300 <= a) { a -= 300; b += 300; }
	}
if (a >= 0) { cout << b * 1.2 +a<< endl; }
return 0;

}