#include <iostream>

using namespace std;

int main() {
    string route;
    
    cin >> route;
    
    int curr = 1;
    for (int i = 0; i < route.length(); i++) {
        if (route[i] == 'L') {
            curr = curr * 2;
        } else {
            curr = curr * 2 + 1;
        }
    }
    
    cout << curr << endl;
    
    return 0;
}