Line Follower Robot with Arduino

void setup() {
  // put your setup code here, to run once:
pinMode(2, INPUT_PULLUP);
pinMode(3, INPUT_PULLUP);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(6, OUTPUT);
pinMode(7, OUTPUT);

}

void loop() {

  int m= digitalRead(2); //sensor 1
  int n= digitalRead(3); //sensor 2 
  if (m==HIGH)

  {
    digitalWrite(4, HIGH);   //motor 2
    digitalWrite(5, LOW);
    digitalWrite(6, LOW);   //motor 2
    digitalWrite(7, HIGH);
    }

    else if
    (n==HIGH)
    {
      digitalWrite(6, HIGH);   //motor 1
    digitalWrite(7, LOW);
    digitalWrite(4, LOW);   //motor 2
    digitalWrite(5, HIGH);
      }

      else
      {
        digitalWrite(4, HIGH);   //motor1
    digitalWrite(5, LOW);
    digitalWrite(4, HIGH);   //motor 2
    digitalWrite(5, LOW);
        }
  // put your main code here, to run repeatedly:

}