import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int s = sc.nextInt();
        int ans;
        if (s == 1 || Math.abs(s - a) <= Math.abs(s - b)) {
            ans = Math.abs(s - a) + s;
        } else if (a == 0) {
            ans = Math.abs(s - b) + s + 1;
        } else {
            ans = Math.min(Math.abs(s - b) + s - 1 + Math.abs(a - 1) + 1, Math.abs(s - b) + Math.abs(s - a) + a);
        }
        System.out.println(ans);
    }
}