//{{{
#include <bits/stdc++.h>
using namespace std;
#define rep(...) repN((__VA_ARGS__,rep3,rep2,loop,~))(__VA_ARGS__)
#define loop(n) rep2(_loop_,n)
#define rep2(i,n) rep3(i,0,n)
#define rep3(i,begin,end) for(int i=(int)(begin),i##_end=(int)(end);i<i##_end;++i)
#define repN(a) repX a
#define repX(a0,a1,a2,x,...) x
typedef long long ll;
const int MOD = 1e9+7;
//}}}

int main(){
	char s[32];
	fgets(s, 32, stdin);
	ll ans = 1;
	rep(i, strlen(s) - 1){
		ans *= 2;
		if(s[i] == 'R') ans += 1;
	}
	printf("%lld\n", ans);
	return 0;
}