class Program
{
    static void Main(string[] args)
    {
        string[] input = Console.ReadLine()!.Split(' ');
        decimal holiday1 = decimal.Parse(input[0]);
        decimal holiday2 = decimal.Parse(input[1]);
        decimal now = decimal.Parse(input[2]);

        if (now >= holiday2)
        {
            Console.WriteLine(now - 2);
        }
        else if (now < holiday2)
        {
            Console.WriteLine(now - 1);
        }
        else
        {
            Console.WriteLine(now);
        }
    }
}