import java.util.*;
import java.io.*;
import java.math.*;

public class No126 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt(), b = sc.nextInt(), s = sc.nextInt();
		int t = 0;
		if(Math.abs(a-s) <= Math.abs(b-s) || s == 1) {
			t = Math.abs(a-s) + s;
		}else {
			// 1階へ
			t = Math.abs(b-s) + (s-1) + Math.abs(a-1) + 1;
			// Aへ
			int u = Math.abs(b-s) + Math.abs(a-s) + Math.abs(a-1) + 1;
			t = Math.min(t, u);
		}
		System.out.println(t);
	}
}