using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Collections.Generic;
using System.Diagnostics;
using System.Numerics;
using Enu = System.Linq.Enumerable;
using System.Threading;

class Program
{
    static readonly int MaxF = 100;

    public void Solve()
    {
        int A = Reader.Int(), B = Reader.Int(), C = Reader.Int();
        var seen = new bool[MaxF + 1, MaxF + 1, MaxF + 1];
        var minCost = new int[MaxF + 1, MaxF + 1, MaxF + 1];
        var que = new Queue<int>();
        que.Enqueue(A); que.Enqueue(B); que.Enqueue(C);
        int ans = int.MaxValue;

        while (que.Count > 0)
        {
            int a = que.Dequeue(), b = que.Dequeue(), c = que.Dequeue();
            for (int next = 0; next <= MaxF; next++)
            {
                int[] at = { a, b };
                int which = (c == 1 && next == 0 || Math.Abs(a - c) <= Math.Abs(b - c)) ? 0 : 1;
                if (next == 0 && which == 1) continue;
                int moves = minCost[a, b, c] + Math.Abs(at[which] - c) + Math.Abs(c - next);
                at[which] = next;
                if (next == 0) ans = Math.Min(ans, moves);
                else if (!seen[at[0], at[1], next] || moves < minCost[at[0], at[1], next])
                {
                    seen[at[0], at[1], next] = true;
                    minCost[at[0], at[1], next] = moves;
                    que.Enqueue(at[0]); que.Enqueue(at[1]); que.Enqueue(next);
                }
            }
        }

        Console.WriteLine(ans);
    }

}



class Entry { static void Main() { new Program().Solve(); } }
class Reader
{
    private static TextReader reader = Console.In;
    private static readonly char[] separator = { ' ' };
    private static readonly StringSplitOptions op = StringSplitOptions.RemoveEmptyEntries;
    private static string[] A = new string[0];
    private static int i;
    private static void Init() { A = new string[0]; }
    public static void Set(TextReader r) { reader = r; Init(); }
    public static void Set(string file) { reader = new StreamReader(file); Init(); }
    public static bool HasNext() { return CheckNext(); }
    public static string String() { return Next(); }
    public static int Int() { return int.Parse(Next()); }
    public static long Long() { return long.Parse(Next()); }
    public static double Double() { return double.Parse(Next()); }
    public static int[] IntLine() { return Array.ConvertAll(Split(Line()), int.Parse); }
    public static int[] IntArray(int N) { return Enu.Range(0, N).Select(i => Int()).ToArray(); }
    public static int[][] IntTable(int H) { return Enu.Range(0, H).Select(i => IntLine()).ToArray(); }
    public static string[] StringArray(int N) { return Enu.Range(0, N).Select(i => Line()).ToArray(); }
    public static string Line() { return reader.ReadLine().Trim(); }
    private static string[] Split(string s) { return s.Split(separator, op); }
    private static string Next() { CheckNext(); return A[i++]; }
    private static bool CheckNext()
    {
        if (i < A.Length) return true;
        string line = reader.ReadLine();
        if (line == null) return false;
        if (line == "") return CheckNext();
        A = Split(line);
        i = 0;
        return true;
    }
}