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

int main(void) {
	int street = 1;
	char turn[31];

	scanf("%s", &turn);
	for (int i = 0; turn[i] == 'L' || turn[i] == 'R'; i++) {
		if (turn[i] == 'L')
			street = street * 2;
		else if (turn[i] == 'R')
			street = (street * 2) + 1;
		else
			break;
	}
	printf("%d\n", street);

	return 0;
}