#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    long long now = 1, l = -1, r = -1;
    string s;
    if (cin >> s){
        for (int i = 0; i < s.size(); i++){
            if (s[i] == 'L') now *= 2;
            else now = now*2 + 1;
        }

    }
    cout << now << endl;
}