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