using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = long.Parse(line[0]);
        var b = long.Parse(line[1]);
        var c = long.Parse(line[2]);
        var ans = c;
        if (a <= c) ans--;
        if (b <= c) ans--;
        Console.WriteLine(ans);
    }
}