#include <bits/stdc++.h>
using namespace std;
long long INF = 2000000000000000000;
int main(){
  long long V, T, P;
  cin >> V >> T >> P;
  long long tv = 0;
  long long fv = INF;
  while (fv - tv > 1){
    long long mid = (tv + fv) / 2;
    if (mid - mid / T <= V * (P + 1)){
      tv = mid;
    } else {
      fv = mid;
    }
  }
  cout << fv << endl;
}