using System;
using System.Linq;

namespace Streak
{
    public class Streak
    {
        public static int Main()
        {
            var a = Console.ReadLine().Split(' ').Select(x => long.Parse(x)).ToArray();
            Console.WriteLine(a[2] - (a[0] <= a[2] ? 1 : 0) - (a[1] <= a[2] ? 1 : 0));
            return 0;
        }
    }
}