#include <stdio.h>
#include <math.h>

int main() {
	char s[30], c;
	long long int min, max;
	int n = 0, i;

	for (i = 0; (c = getchar()) != '\n'; i++) {
		s[i] = c;
		n++;
	}

	min = (long long int)pow(2, n);
	max = (long long int)pow(2, n + 1) - 1;

	for (i = 0; i < n; i++) {
		if (s[i] == 'L') {
			max = (min + max - 1) / 2;
		}
		else if (s[i] == 'R') {
			min = (min + max + 1) / 2;
		}
	}

	printf("%d\n", (int)min);

	return 0;
}