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

int main()
{
	char S[31];
	scanf("%s", &S);

	int road = 1;

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

	printf("%d", road);

	return 0;
}