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 sum = 0;

		if(Math.abs(a-s) < Math.abs(b-s)){
			// aの方が近い
			sum += Math.abs(a-s) + s;
		}else{
			// bの方が近い
			sum += Math.abs(b-s) + Math.abs(s-a) + a;
			if(a == 0) {
				sum++;
			}
		}
		System.out.println(sum);
	}
}