#include<bits/stdc++.h>
using namespace std;

const long long INF = 1LL << 60;
#define MOD 1000000007;

typedef long long ll;

#define writeln(n) cout<<n<<endl;

typedef pair<float, float> P;

typedef pair<string, int> Psi;


int main() {

	string ss;
	cin>>ss;

	int sum =1;
	for(char e: ss){
		if(e =='L'){
			sum +=sum;
		}else {
			sum += sum+1;
		}
	}

	writeln(sum);




}