#include <bits/stdc++.h>

using namespace std;

#define fst(t) std::get<0>(t)
#define snd(t) std::get<1>(t)
#define thd(t) std::get<2>(t)
#define unless(p) if(!(p))
#define until(p) while(!(p))

using ll = long long;
using P = std::tuple<int,int>;

const int dx[8] = {-1, 1, 0, 0, -1, -1, 1, 1}, dy[8] = {0, 0, -1, 1, -1, 1, -1, 1};

int main(){
    std::cin.tie(nullptr);
    std::ios::sync_with_stdio(false);

    string S;
    std::cin >> S;

    int L = S.size();
    int pos = 0;
    ll res = 0ll;
    
    while(pos < L){
        if(pos + 3 < L && S[pos + 3] == 'u'){
            res = res * 2 + 1;
            pos += 4;
        }else{
            res = res * 2;
            pos += 3;
        }
    }

    res <<= 1;

    std::cout << res << std::endl;
}