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

int main(void){
	int i, len;
	int road = 1;
	char s[100];
	fgets(s, sizeof(s), stdin);
	len = strlen(s);
	for(i=0;i<len;i++){
		if(s[i] == 'L'){
			road = road * 2;
		}else if(s[i] == 'R'){
			road = road * 2 + 1;
		}else{
			break;
		}
	}
	
	printf("%d\n", road);
	return 0;
}