#include <iostream>
#include <cmath>
using namespace std;
int main() {
    int m, t, s;
	cin >> m >> t >> s;
	if(t == 0) {
		cout << 0 << endl;
	}
	if(s % t == 0){
	  cout << max(m - s / t, 0) << endl;  
	} else {
	　cout << max(m - s / t - 1, 0) << endl;　
	｝
	return 0;
}