int button = 2;
int red = 13;
int yellow = 12;
int green = 11;

void setup() {
  pinMode(red,OUTPUT);
  pinMode(yellow,OUTPUT);
  pinMode(green,OUTPUT);
  pinMode(button,INPUT);

}

void loop() {
  digitalWrite(red,HIGH);
if (digitalRead(button) == HIGH){
 delay(500);
 digitalWrite(yellow,HIGH);
 delay(10000);
 digitalWrite(red,LOW);
 digitalWrite(yellow,LOW);
 delay(100);
 digitalWrite(green,HIGH); 
 delay(20000);
 digitalWrite(green,LOW); 
 delay(500);
  }
}