using System;
using System.Collections.Generic;
using System.Linq;

public class Yuki857
{
	public static void Main()
	{
		var xyz = Console.ReadLine().Split(' ').Select(x => int.Parse(x)).ToList();
		var ans = xyz[2];
		if(xyz[0] <= xyz[2]) ans -= 1;
		if(xyz[1] <= xyz[2]) ans -= 1;
		
		Console.WriteLine(ans);
	}
}