package P126;

import java.util.Scanner;

public class P126 {
	
	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);
		String r = sc.nextLine();
		String[] rstrs = r.split(" ",0);

		int a = Integer.parseInt(rstrs[0]);
		int b = Integer.parseInt(rstrs[1]);
		int s = Integer.parseInt(rstrs[2]);
		int ans = 0;
		
		if (Math.abs(s-a) <= Math.abs(s-b)) {
			ans = Math.abs(s-a) + (s-0);
		} else if (Math.abs(s-a) > Math.abs(s-b) && a >= 1) {
			ans = Math.abs(s-b) + Math.abs(s-a) + a;
		} else {
			ans = Math.abs(s-b) + Math.abs(s-1) + 2; 
		}
		
		System.out.println(ans);
	}
}