代码如下qwq：

#include <iostream>
using namespace std;
int a, e, t;
int main(){
	cin >> a >> e >> t;
	if(e == 0){
		cout << 0 << endl;
	} else {
		if(t / e >= a){
			cout << 0 << endl;
		} else {
			cout << a - t / e << endl;
		}
	}
	return 0;
}