// No.104 国道
// https://yukicoder.me/problems/no/104
//
#include <iostream>
using namespace std;

unsigned int solve(string &S);


int main() {
    string S;
    cin >> S;
    unsigned int ans = solve(S);
    cout << ans << endl;
}

unsigned int solve(string &S) {
    unsigned int road_num = 1;
    for (char s: S) {
        if (s == 'L')
            road_num *= 2;
        else
            road_num = road_num * 2 + 1;
    }
    return road_num;
}