#include <iostream>
#include <cmath>

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

    if (std::abs(a - s) <= std::abs(b - s) || s == 1) {
        std::cout << std::abs(a - s) + s << std::endl;
    } else {
        std::cout << std::abs(b - s) + (s - 1) + a << std::endl;
    }
}

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

    solve();

    return 0;
}