#include <stdio.h>
int main()
{
  char s[31] = "";
  scanf("%s", &s);
  int i = 0, ans = 1;
  while (s[i] != '\0')
  {
    if (s[i] == 'L')
      ans = ans * 2;
    if (s[i] == 'R')
      ans = ans * 2 + 1;
    i++;
  }
  printf("%d", ans);
  return 0;
}