#include <iostream>
#include <cmath>

void solve() {
    int a, b, s;
    std::cin >> a >> b >> s;

    int ans;
    if (std::abs(a - s) <= std::abs(b - s) || s == 1) {
        ans = std::abs(a - s) + s;
    } else {
        ans = std::abs(b - s) + std::min(std::abs(s - a), s - 1) + a;
    }

    std::cout << ans << std::endl;
}

int main() {
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    solve();

    return 0;
}