#include <iostream>
#include <math.h>

int main()
{
    int a, b, s;
    int move = 0;
    std::cin >> a >> b >> s;
    
    int *m = (abs(s - a) <= abs(s - b))? &a : &b;
    
    move += abs(s - (*m));
    move += s - 1;
    *m = 1;
    
    move += abs(a - 1);
    move++;
    
    std::cout << move << std::endl;
    
    return 0;
}