int red=2,gre=3,blu=4,pb=6,dl=1000;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(red, OUTPUT);
pinMode(gre, OUTPUT);
pinMode(blu, OUTPUT);
pinMode(pb, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int val = digitalRead(pb);
if(val==1) { 
digitalWrite(red,1);
delay(dl);
digitalWrite(red,0);

digitalWrite(gre,1);
delay(dl);
digitalWrite(gre,0);

digitalWrite(blu,1);
delay(dl);
digitalWrite(blu,0);
}
else {
digitalWrite(red,0);
digitalWrite(gre,0);
digitalWrite(blu,0);
}
}