using System;

namespace yoru
{
	class Program
	{
		static void Main(string[] args)
		{
			string[] inputString = Console.ReadLine().Split(' ');
			Int64 A = Int64.Parse(inputString[0]);
			Int64 B = Int64.Parse(inputString[1]);
			Int64 C = Int64.Parse(inputString[2]);

			Int64 diff1 = (A > B) ? (A - B) : -(A - B);
			Int64 diff2 = (B > C) ? (B - C) : -(B - C);
			Int64 diff3 = (C > A) ? (C - A) : -(C - A);

			Int64 diffMin = Math.Min(diff1, Math.Min(diff2, diff3));

			Console.WriteLine(diffMin.ToString());
			return;
		}
	}
}