int led1= 0;
int led2= 1;
int led3= 2;
int led4= 3;
int pb1= 7;
int pb2= 6;
int pb3= 5;
int pb1nyala= 0;
int pb2nyala = 0;
int pb1mati = 0;
int pb2mati = 0;

void setup() {
  // put your setup code here, to run once:
 pinMode (led1,OUTPUT);
 pinMode (led2,OUTPUT);
 pinMode (led3,OUTPUT);
 pinMode (led4,OUTPUT);
 pinMode (pb1,INPUT);
 pinMode (pb2,INPUT);
 

}

void loop() {
  // put your main code here, to run repeatedly:
  pb1nyala = digitalRead(pb1);
  pb2nyala = digitalRead(pb2);
  

  if(pb1nyala == HIGH && pb1mati == LOW){

 digitalWrite(led1,HIGH);
 delay (50);
 digitalWrite(led1,LOW);
 digitalWrite(led2,HIGH);
 delay (50);
  digitalWrite(led2,LOW);
 digitalWrite(led3,HIGH);
 delay (50);
  digitalWrite(led3,LOW);
 digitalWrite(led4,HIGH);
 delay (50);
  digitalWrite(led4,LOW);
  delay(50);
  }

   if(pb2nyala == HIGH&& pb2mati == LOW){
 digitalWrite(led4,HIGH);
 delay (1000);
  digitalWrite(led4,LOW);
 digitalWrite(led3,HIGH);
 delay (1000);
  digitalWrite(led3,LOW);
 digitalWrite(led2,HIGH);
 delay (1000);
  digitalWrite(led2,LOW);
 digitalWrite(led1,HIGH);
 delay (1000);
  digitalWrite(led1,LOW);
  delay(50);
  }

 
  pb1mati=pb1nyala;
  pb2mati=pb2nyala;
}