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