Smart fire alarm system

#define FLAME 3 // connect DO pin of sensor to this pin
const int led1 = 10;
const int led2 =9;
const int led3 = 8;
const int led4 =7;
int buzzer = 13; 
void setup() {
 Serial.begin(9600);
 
 pinMode(FLAME, INPUT);//define FLAME input pin
 pinMode(buzzer, OUTPUT);//define ALARM output pin
 pinMode(led1,OUTPUT);
 pinMode(led2,OUTPUT);
 pinMode(led3,OUTPUT);
 pinMode(led4,OUTPUT);
}
void loop() {
   
 int fire = digitalRead(FLAME);// read FLAME sensor
 if( fire == HIGH)
 {
   digitalWrite(buzzer,HIGH);
   digitalWrite(led1,HIGH);
   digitalWrite(led2,HIGH);
   digitalWrite(led3,LOW);
   digitalWrite(led4,LOW);// set the buzzer ON
   Serial.println("Fire");
 }else{
   digitalWrite(buzzer,LOW);
   digitalWrite(led3,HIGH);
   digitalWrite(led4,HIGH);
   digitalWrite(led1,LOW);
   digitalWrite(led2,LOW);
   // Set the buzzer OFF
   Serial.println("no fire");
   
 }
 delay(200);
}