#include<bits/stdc++.h>
using namespace std;
int main(){
  int X,Y,Z;
  cin>>X>>Y>>Z;
  if(Y*Z%X==0){cout<<Y*Z/X-1<<endl;}
  else {cout<<Y*Z/X<<endl;}
}
#include <stdio.h>
#include <stdlib.h>

#include <algorithm>
#include <cmath>
#include <iomanip>
#include <iostream>
#include <string>
#include <vector>
using namespace std;
using ll = long long int;
using ull = unsigned long long int;

template <class T>
inline bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template <class T>
inline bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

int main() {
    double x, y, z;
    cin >> x >> y >> z;

    for (double i = 1000000; i > 0; i--) {
        if (i / z < y / x) {
            cout << i << endl;
            return 0;
        }
    }

    cout << 0 << endl;
}