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

int main(void)
{
    int route=1;
    char LorR[30]="";
    scanf("%s",LorR);
    for(int i=0;i<strlen(LorR);i++)
    {
        if(LorR[i]=='L')
        {
            route=route*2;
        }
        else if(LorR[i]=='R')
        {
            route=route*2+1;
        }
        
    }
    printf("%d",route);
    
}