#include <iostream>

class Yuki
{
public:
  long long int old;
  long long int sum;

};

int main(void)
{
  long long int a, b, c; 

  scanf("%lld %lld %lld", &a, &b, &c);

  
  Yuki yuki;
  yuki.sum=0;
  yuki.old = 1;

  while(1)
  {
    
    if(yuki.old % a != 0){
      yuki.sum++;
    } else {
      yuki.sum += b;
    }

    if(yuki.sum >= c){
      break;
    } 
    yuki.old++;
  }

  printf("%lld\n", yuki.old);

  return 0;
}