#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>

using namespace std;


int main(){
	int a,b,s;
	cin >> a >> b >> s;
	int ans = 0;
	if(s>1){
		if(abs(s-a) <= abs(s-b)){
			ans += abs(s-a)+s;
		}else{
			ans += abs(s-b);
			ans += abs(b-a);
			ans += a;
		}
	}else{
		ans = abs(a-s)+1;
	}
	cout << ans << endl;
	return 0;
}