#include <sstream>
#include <string>
#include <vector>
#include <map>
#include <algorithm>
#include <iostream>
#include <utility>
#include <set>
#include <cctype>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstdlib>
#include <cmath>

#define INF 1000000000

using namespace std;
typedef long long ll;

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