#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <math.h>

int main()
{
	char str[31] = "";
	int load = 1;

	scanf("%s", str);

	for (int i = 0;str[i] != '\0';i++)
	{
		if (str[i] == 'L')
		{
			load *= 2;
		}
		else if (str[i] == 'R')
		{
			load = load * 2 + 1;
		}
	}

	printf("%d\n", load);

	return 0;
}