#include<iostream>
#include<string>
#define rep(i,a) for(int i=0;i<(a);++i)

std::string S;

int main()
{
	int ans = 1;
	std::getline( std::cin, S );
	rep( i, S.size() )
	{
		if( S[i] == 'L' )
			ans <<= 1;
		else if( S[i] == 'R' )
			ans = (ans<<1)+1;
	}

	printf( "%d\n", ans );

	return 0;
}