#include <bits/stdc++.h>
#define For(i, a, b) for(int i = a; i < b; i++)
#define rep(i, n) For(i, 0, n)
#define rFor(i, a, b) for(int i = a; i >= b; i--)
#define ALL(v) (v).begin(), (v).end()
#define rALL(v) (v).rbegin(), (v).rend()
using namespace std;

using lint = long long;
using ld = long double;

int INF = 2000000000;
lint LINF = 1000000000000000000;

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