void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}
void getOdd(int number) {
  for (int i = 0; i <= number; i++) {
    if (i % 2 != 0) {
      Serial.print(i);
      Serial.println(":Hello world");
    }
  }
}
void loop() {
  // put your main code here, to run repeatedly:
  char inputChar;
  String inputString;
  int inputNumber;
  if (Serial.available() > 0) {
    inputChar = Serial.read();
    if (inputChar == '\n') {
      inputNumber = inputString.toInt();
      Serial.print("Received: 0 ");
      Serial.println(inputNumber);
      getOdd(inputNumber);
      inputString = "";
    }
    else {
      inputString += inputChar;
    }
  }
  delay(1000);
}