#include<iostream>
#include<string>
using namespace std;
int main(){
    string S;
    cin>>S;
    int n=1;
    for(int i=0;i<S.length();i++){
        if(S[i]=='L'){
            n+=n;
        }else{
            n+=n+1;
        }
    }
    cout<<n<<endl;
}