#include <iostream>
#include <cmath>
#include <algorithm>
using namespace std;
int main(){
	int a,b,s;	cin>>a>>b>>s;
	int count=0;
	if(a==0){
		a++; count++;
	}
	if(s==1) count+=abs(a-s)+1;
	else if(abs(a-s)<=abs(b-s))	count+=abs(a-s)+s;
	else count+=abs(b-s)+min(abs(a-s)+a,s-1+abs(a-1)+1);
	cout<<count<<endl;
	return 0;
}