#include <stdio.h>
int main(){
    //iuput
    char S[30+1];
    scanf("%s",S);

    //search load
    int cLoad = 1;
    for (int i = 0;i < 30+1;i++){
        if (S[i] != '\0'){
            if (S[i] == 'L') cLoad = 2*cLoad;
            if (S[i] == 'R') cLoad = 2*cLoad+1;
        }else{
            break;
        }
    }

    //ouput
    printf("%d\n",cLoad);
    return 0;
}