int SW1 = 0; //button1
int SW2 = 0; //button2
void setup() {
  pinMode(16, INPUT); //button1
  pinMode(17, INPUT); //button2
  pinMode(18, OUTPUT); //LED1
  pinMode(19, OUTPUT); //LED2
  pinMode(21, OUTPUT); //LED3
  pinMode(22, OUTPUT); //LED4
}

void loop() {
  SW1 = digitalRead(16);
  SW2 = digitalRead(17);

  if(SW1 == 1){
    digitalWrite(18, 1);
  }
  else{
    digitalWrite(18, 0);
  }
 
}