using System;
using System.Collections;
using System.Collections.Generic;
 
class TEST{
	static void Main(){
		Sol mySol =new Sol();
		mySol.Solve();
	}
}

class Sol{
	public void Solve(){
		
		int ans=0;
		if(Math.Abs(S-A)<=Math.Abs(S-B)){
			ans=Math.Abs(S-A)+S;
			Console.WriteLine(ans);
			return;
		}
		ans=Math.Abs(S-B);
		if(A!=0){
			ans+=Math.Min(Math.Abs(S-A)+A+1,S-1+Math.Abs(A-1)+1);
		}
		if(A==0){
			ans+=S-1+Math.Abs(A-1)+1;
		}
		Console.WriteLine(ans);
		
	}
	int A,B,S;
	public Sol(){
		var d=ria();
		A=d[0];B=d[1];S=d[2];
	}




	static String rs(){return Console.ReadLine();}
	static int ri(){return int.Parse(Console.ReadLine());}
	static long rl(){return long.Parse(Console.ReadLine());}
	static double rd(){return double.Parse(Console.ReadLine());}
	static String[] rsa(){return Console.ReadLine().Split(' ');}
	static int[] ria(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>int.Parse(e));}
	static long[] rla(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>long.Parse(e));}
	static double[] rda(){return Array.ConvertAll(Console.ReadLine().Split(' '),e=>double.Parse(e));}
}