#include <bits/stdc++.h>
using namespace std;

int main() {
    int A, B, S, ans;
    cin >> A >> B >> S;

    if (abs(S - A) <= abs(S - B) || S == 1) {
        ans = abs(S - A) + abs(S);
    } else if (A == 0) {
        ans = abs(S - B) + abs(S - 1) + 2;
    } else {
        ans = min(abs(S - B) + abs(S - A) + abs(A),
            abs(S - B) + abs(S - 1) + abs(A));
    }
    cout << ans << endl;
}