#include <stdio.h>
#include <math.h>

#include <iostream>
#include <vector>
#include <algorithm>

int main() {

  long i;

  long a, b, s;
  long a_s;
  long b_s;
  long ans;
  long route1, route2;

  std::cin >> a >> b >> s;

  a_s = abs(a-s);
  b_s = abs(b-s);

  if( s == 1 || a_s <= b_s ) {
    ans = a_s + s;
  }
  else {
    if( a == 0 ) {
      ans = b_s + abs(s-1) + 2;
    }
    else {
      route1 = b_s + abs(s-a) + a;
      route2 = b_s + abs(s-1) + a;
      if(route2 < route1) {
	ans = route2;
      }
      else {
	ans = route1;
      }
    }
  }

  std::cout << ans << std::endl;
  
  return 0;
}