#include <bits/stdc++.h>

using namespace std;

int main() {
    int m, t, s;
    cin >> m >> t >> s;
    if (t == 0)cout << 0 << endl;
    else if (m > s / t && s % t == 0) cout << m - s / t << endl;
    else if (m > s / t && s % t > 0)cout << m - s / t - 1 << endl;
    else if (s <= t) cout << m - 1 << endl;
    else cout << 0 << endl;
    return 0;
}