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

void loop() {
int X = digitalRead(2);
if ( X == 0 ){
digitalWrite(3, HIGH);
}
else if ( X == 1 ){
digitalWrite(3, LOW);
}
delay(20);
int j = digitalRead(4);
if ( j == 0) {
  digitalWrite(5 , HIGH);
delay(20);
}
else
{
  digitalWrite(5, LOW);
  delay(20);
}
int i = digitalRead(6);
if ( i == 0) {
  digitalWrite(7, HIGH);
  delay(20);
}
else
{
 digitalWrite(7, LOW);
 delay(20);
}
}