void setup() {
pinMode(10, OUTPUT);
pinMode(7, OUTPUT);
pinMode(9, OUTPUT);
}

void loop() {
for(int a=0; a<3;a++ ){
digitalWrite(10, HIGH);
delay(500);
digitalWrite(10, LOW);
delay(500);
}

for(int a=0; a<4;a++ ){
digitalWrite(7, HIGH);
delay(500);
digitalWrite(7, LOW);
delay(500);
}

for(int a=0; a<5;a++ ){
digitalWrite(9, HIGH);
delay(500);
digitalWrite(9, LOW);
delay(500);
}

}