做题地址：https://www.luogu.com.cn/problem/P5709
注意t==0
#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>using namespace std;int n, t, s;int main(){
cin >> n >> t >> s;if (t == 0){
cout << 0 << endl;return 0;}int res = (s / t) + (s % t != 0);if (n - res > 0) cout << n - res << endl;else cout << 0 << endl;return 0;
}