// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

int main() {
    std::ios::sync_with_stdio(false);
    std::string s; cin >> s;
    int x = 1;
    for(char c : s)
        if(c == 'L')
            x = x * 2;
        else
            x = x * 2 + 1;
    cout << x << '\n';
}