#include <stdio.h>

int main(void) {
	int i, r;
	char str[31];
	scanf("%s", str);
	//printf("%s\n", str);
	i = 0;
	r = 1;
	while(str[i] != '\0'){
		if(str[i] == 'L')     r = 2 * r;
		else if(str[i] == 'R')r = 2 * r + 1;
		else break;
		i++;
	}
	printf("%d\n", r);
	
	return 0;
}