function fizzbuzzy(n) {
  var three = Math.floor(n/3)+1;
  var five = Math.floor(n/5)+1;
  return three+five;
}

public class Primes {
  public static boolean isAPrime(int number) {
    for (int i=2;i*i<=number;i++)
    {
      if (number % i == 0)
        return false;
    }
    
    return true;
  }
}