#include <cstdio>
#include <iostream>
#include <sstream>
#include <fstream>
#include <iomanip>
#include <algorithm>
#include <cmath>
#include <string>
#include <vector>
#include <list>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <bitset>
#include <numeric>
#include <limits>
#include <climits>
#include <cfloat>
#include <functional>
using namespace std;

int main()
{
    int a, b, s;
    cin >> a >> b >> s;

    int ret;
    if(abs(a - s) <= abs(b - s)){
        ret = abs(a - s) + s;
    }
    else if(s == 1){
        ret = abs(a - 1) + 1;
    }
    else{
        ret = abs(b - s) + (s - 1) + abs(a - 1) + 1;
        if(a > 0)
            ret = min(ret, abs(b - s) + abs(s - a) + a);
    }
    cout << ret << endl;

    return 0;
}