#include<bits/stdc++.h>
#define pb emplace_back
#define pf first
#define ps second
#define all(x) x.begin(),x.end()
#define allr(x) x.rbegin(),x.rend()
#define Endl '\n'
#define codejam cout<<"Case #"<<t<<": ";
#define pl pair<ll,ll>
#define mod 1000000007
#define INF 1000000001
#define forn(i,n) for(ll i=0;i<n;i++)
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);
using namespace std;
typedef long long int ll;
ll gcd(ll a,ll b)
{
    if(b==0) return a;
    return gcd(b,a%b);
}

//////////////////////////////////// JAI SHREE RAM /////////////////////////////////////
const ll N=1e5;
void JAISHREERAM()
{
    double x,y,z;
    cin>>x>>y>>z;
    double val=y/x*z,f=floor(val);
    ll ans=0;
    if(f==val) ans=val-1;
    else ans=floor(val);
    cout<<ans;
}
int main()
{
    fast;
    int T=1;
    // cin>>T;
    for(int t=1;t<=T;t++)
    {
        // codejam
        JAISHREERAM();
    }
    return 0;
}
#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <queue>
#include <utility>
#include <tuple>
#include <cmath>
#include <numeric>
#include <set>
#include <map>
#include <array>
#include <complex>
#include <iomanip>
#include <cassert>
#include <random>
using ll = long long;
using std::cin;
using std::cout;
using std::endl;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
const int inf = (int)1e9 + 7;
const long long INF = 1LL << 60;

void solve()
{
  ll x, y, z; cin >> x >> y >> z;
  ll res = 0;
  for (ll i = 0; i <= 10000000; ++i)
  {
    //y/x > i/z
    if(y * z > i * x)
    {
      chmax(res, i);
    }
    else
      break;
  }
  cout << res << "\n";
}
int main()
{
  std::cin.tie(nullptr);
  std::ios::sync_with_stdio(false);

  int kkt = 1;
  //cin >> kkt;
  while(kkt--)
    solve();
  return 0;
}