#include <stdio.h>


int main()
{
  int n;
  char c;

  while (scanf(" %d %c", &n, &c) == 2) {
    if (n == 1) {
      printf("1\n");
      continue;
    }

    if (c == 'N') {
      if (n == 2) printf("1\n");
      else printf("2\n");
    }
    else if (c == 'R' || c == 'B') {
      printf("%d\n", n);
    }
    else printf("4\n");

  }

  return 0;
}