public int greenTicket(int a, int b, int c) {
  // Use the transitive property of equality
  // No need to check whether a == c if you check the other 2 cases
  if (a == b && b == c) {
    return 20;
  }

  // If we have gotten to here, then all 3 numbers are NOT the same,
  // i.e., at least one of the numbers is different
  // Hence no need for something like: if (a == b && b != c)
  else if (a == b || a == c || b == c) {
    return 10;
  }

  // If we have gotten to here, all of the numbers are different.
  // Hence, no need for the IF statement.
  else {
    return 0; // if (a != b && b != c && a != c)
  }
}