#include<stdio.h>

int main()
{
  int road=1;
  char way[31];
  int i=0;

  scanf("%s",way);

  while (way[i]!='\0') {
    if (way[i]=='L') {
      road=road*2;
    } else if (way[i]=='R') {
      road=road*2+1;
    }
    i++;
  }

  printf("%d\n",road);
  return 0;
}