#include<stdio.h>

int main(){
	int i,road=1;
	char c[30];
	scanf("%s",c);
	while(c[i]!='\0'){
		if(c[i]=='L')road=road*2;
		if(c[i]=='R') road=road*2+1;
		i++;
	}
	printf("%d",road);
}