class Program
{
    static void Main(string[] args)
    {
        string inputDirection = Console.ReadLine()!;
        int num = 1;
        
        foreach (char c in inputDirection)
        {
            if (c == 'L')
            {
                num = num * 2;
            }
            else
            {
                num = num * 2 + 1;
            }
        }
        Console.WriteLine(num);
    }
}