Pasted

void setup() {
  Serial.begin(9600);
  Serial.println("Enter maximum number to count:");
  while (Serial.available() == 0);
  int maxNumber = Serial.parseInt();
 
  for (int i = 0; i <= maxNumber; i++) {
    Serial.println(i);
  }
}
 
void loop() {
  // put your main code here, to run repeatedly:
 
}