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

int main(){
    char str[31];
    int len, road = 1, i;

    scanf("%s\n", str);
    len = strlen(str);

    for(i = 0; i < len; i++){
        if(str[i] == 'L'){
            road = road*2;
        }else if(str[i] == 'R'){
            road = road*2 + 1;
        }
    }
    printf("%d\n", road);

    return 0;
}