#include <bits/stdc++.h>
using namespace std;

int main() {
    int cur = 1;
    string s;
    cin >> s;
    for (auto c : s) {
        if (c == 'L')
            cur *= 2;
        else {
            cur *= 2;
            cur++;
        }
    }
    cout << cur << endl;
    return 0;
}