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

class MyClass
{
    public static void Solve()
    {
        var input = Console.ReadLine().Split().Select(long.Parse).ToArray();
        var X = input[0];
        var Y = input[1];
        var Z = input[2];
        Console.WriteLine(Z < X ? Z : Z < Y ? Z - 1 : Math.Max(Z - 2, 0));
    }

    public static void Main()
    {
        var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        Console.SetOut(sw);
        Solve();
        Console.Out.Flush();
    }
}