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