#include <stdio.h>
#include <string.h>

int main()
{
	char S[31] = "";
	int len;
	scanf("%[^\n]%n", &S, &len);

	int road = 1;

	for (int i = 0; i < len; i++)
	{
		if (S[i] == 'L')
		{
			road = road * 2;
		}
		else if (S[i] == 'R')
		{
			road = road * 2 + 1;
		}
	}

	printf("%d", road);

	return 0;
}