#include <iostream>

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

};

int BinarySearch(Yuki yuki, long long int a_num, long long int b_get, long long int c)
{
  long long int nget = yuki.old_start / a_num;
  yuki.sum = b_get * nget + (yuki.old_start - nget);
  
  long long int tmp_p;
  if((yuki.old_start+1)%a_num == 0){
    tmp_p = yuki.sum + b_get;
  } else {
    tmp_p = yuki.sum + 1;
  }

  if(yuki.sum < c){
    if(tmp_p >= c){
      yuki.old = yuki.old_start + 1;
      printf("%lld\n", yuki.old);
      return 0;
    }
    yuki.old_start = (c + yuki.old_start) / 2;
    BinarySearch(yuki, a_num, b_get, c);
  } else if(yuki.sum > c){
    yuki.old_start = yuki.old_start / 2;
    BinarySearch(yuki, a_num, b_get, c);
  } else {
    yuki.old = yuki.old_start;
    printf("%lld\n", yuki.old);
    return 0;
  }

}

int main(void)
{
  long long int a_num, b_get, c; 

  scanf("%lld %lld %lld", &a_num, &b_get, &c);

  
  Yuki yuki;
  yuki.sum=0;
 // yuki.old = 1;
  yuki.old_start = c / 2;

  BinarySearch(yuki, a_num, b_get, c);

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

  return 0;
}