#include <stdio.h>

void main(void){
	char bendStr[100] = "a";
	scanf("%s",bendStr);
	int i = 0;
	int nowLane = 1;
	while(bendStr[i] != '\0'){
		if(bendStr[i] == 'L'){
			nowLane = nowLane * 2;
		}else if(bendStr[i] == 'R'){
			nowLane = nowLane * 2 + 1;
		}
		i++;
	}
	
	printf("%d",nowLane);
}