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

int main() {
  int A; int B; int C;
  cin >> A >> B >> C;
  int sum = 0;
  int age = 1;
  while (sum < C) {
    if (age % A == 0) {
      sum += B;
      age += 1;
    }
    else {
      sum += 1;
      age += 1;
    }
  }
  cout << age-1 << endl;
}