public int teenSum(int a, int b) {
  if ((13 <= a && a <= 19) || (13 <= b && b <= 19)) {
    return 19;
  }
  else {
    return a + b;
  }
}

// you can use this helping method
public boolean inRange(int n, int min, int max) {
  return min <= n && n <= max;
}

public int teenSum(int a, int b) {
  if (inRange(a, 13, 19) || inRange(b, 13, 19)) {
    return 19;
  }
  else {
    return a + b;
  }
}