import java.util.Scanner;

/**
 * Created by poly on 11/29/14.
 */
public class Main {
    static int[][][] memo;

    static int solve(int a, int b, int s) {
        if (s == 1) {
            return Math.abs(a - 1) + 1;
        }
        if (Math.abs(a - s) <= Math.abs(b - s)) {
            return Math.abs(a - s) + s;
        }
        if (memo[a][b][s] > 0) {
            return memo[a][b][s];
        }
        int bmove = Math.abs(b - s);
        int ans = bmove + Math.abs(s - 1) + solve(a, 1, 1);
        if (a != 0) {
            ans = Math.min(ans, bmove + Math.abs(s - a) + solve(a, a, a));
        }
        memo[a][b][s] = ans;
        return ans;
    }

    public static void main(String[] argv) {
        Scanner scanner = new Scanner(System.in);
        int a = scanner.nextInt();
        int b = scanner.nextInt();
        int s = scanner.nextInt();
        memo = new int[101][101][101];
        int ans = solve(a, b, s);
        System.out.println(ans);
    }
}