int switchState = 0;

void setup(){

 pinMode(3,OUTPUT);
 pinMode(4,OUTPUT);
 pinMode(5,OUTPUT);
 pinMode(2,INPUT);

}

void loop(){

 switchState = digitalRead(2);

 if (switchState == LOW) { 
 digitalWrite(3, HIGH); 
 digitalWrite(4, LOW); 
 digitalWrite(5, LOW); 
 } 

 else {
 digitalWrite(3, LOW); 
 digitalWrite(4, LOW);
 digitalWrite(5, HIGH);
 delay(250); 
 digitalWrite(4, HIGH); 
 digitalWrite(5, LOW);
 delay(250); 
 } 

}