#define  _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <algorithm>
#include <utility>
#include <functional>
#include <cstring>
#include <queue>
#include <stack>
#include <math.h>
#include <iterator>
#include <vector>
#include <string>
#include <set>
#include <math.h>
#include <iostream> 
#include<map>
#include <iomanip>
#include <stdlib.h>
#include <list>
#include <typeinfo>
#include <list>
#include <set>
using namespace std;
#define MAX_MOD 1000000007
#define REP(i,n) for(long long i = 0;i < n;++i)
#define LONG_INF 100000000000000
int main() {
	iostream::sync_with_stdio(false);
	int a, b, s;
	cin >> a >> b >> s;
	if (abs(a - s) <= abs(b - s)||s == 1) {
		cout << abs(a - s) + s << endl;
		return 0;
	}
	else {
		int ans = abs(s - b) + (s - 1);
		if (a == 0) ans += 2;
		else ans += a;
		if (a != 0) ans = min(ans, abs(s - b) + abs(s - a) + a);
		cout << ans << endl;
	}
}