void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(13,OUTPUT);
Serial.println("hi");
}

void loop() {
  // put your main code here, to run repeatedly:

if(Serial.available())
{
  int inp=Serial.parseInt();
  digitalWrite(13,HIGH);
  delay(inp*100);
  digitalWrite(13,LOW);
  delay(inp*100);
}

}