int switch1_pin = 3;
int switch2_pin = 13;
int greenLED = 8;
int redLED = 7;
 
int switch1 = 2;
int switch2 = 2;
 
int Delay = 500;
 
void setup() {
  pinMode(greenLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(switch1_pin, INPUT_PULLUP);
  pinMode(switch2_pin, INPUT_PULLUP);
}
 
void loop() {
  switch1 = digitalRead(switch1_pin);
  switch2 = digitalRead(switch2_pin);
 
  if (switch1 == HIGH and switch2 == HIGH) {
   digitalWrite(redLED, HIGH);
   digitalWrite(greenLED, HIGH);
   delay(Delay);
   digitalWrite(redLED, LOW);
   digitalWrite(greenLED, LOW);
   delay(Delay);
  }
  else if (switch1 == HIGH or switch2 == HIGH) {
    digitalWrite(redLED, HIGH);
    digitalWrite(greenLED, LOW);
    delay(Delay);
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, HIGH);
    delay(Delay);
  }
  if (switch1 == LOW and switch2 == LOW) {
    digitalWrite(redLED, LOW);
    digitalWrite(greenLED, LOW);
  }
}