int ledpin1=13;
int ledpin2=12;
int ledpin3=11;

void setup() {
  // put your setup code here, to run once:
pinMode(ledpin1, OUTPUT);
pinMode(ledpin2, OUTPUT);
pinMode(ledpin3, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(ledpin1, HIGH);
delay(1000);
digitalWrite(ledpin1,LOW);
delay(1000);
digitalWrite(ledpin2,HIGH);
delay(500);
digitalWrite(ledpin2,LOW);
delay(500);
digitalWrite(ledpin3,HIGH);
delay(250);
digitalWrite(ledpin3,LOW);
delay(250);
}