#include<stdio.h>
int main(void){
	int a,b,c;
	char s[31];
	
	scanf("%s",s);
	b=1;
	a=0;
	while(s[a] != '\0'){
		if(s[a] == 'L') b = 2*b;
		else if(s[a] == 'R')b = 2*b +1;
		else break;
		a++;
	}
	printf("%d\n",b);
	return 0;
}