#include <bits/stdc++.h>
using namespace std;
int a[20];

int main() {
	bool flag = true;
	int qian = 0,l_x = 0;
	for(int i = 1;i <= 12;i++)cin >> a[i];
	for(int i = 1;i <= 12;i++){
		qian += 300;
		qian -= a[i];
		if(qian < 0) {
			cout << "-" << i << endl;
			return 0;
		}
		l_x += qian / 100 * 100;
		qian %= 100;

	}
	cout << l_x * 1.2;
	return 0;
}

为什么我的答案老是少20 ???