#define _GLIBCXX_DEBUG
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define ALL(v) v.begin(), v.end()
typedef long long ll;

#include <bits/stdc++.h>
using namespace std;

int main() {
  ll v,t,p;
  cin>>v>>t>>p;
  
  ll l=0,r=9223372036854775807;
  while(r-l>1){
    ll m=(l+r)/2;
    if(m-1-(m-1)/t-(p+1)*v>0) r=m;
    else l=m;
  }
  
  cout<<l<<endl;

  return 0;
}