#define sw1 14
#define sw2 13
#define sw3 12
#define led1 23
#define led2 22
#define led3 21
int val1,val2,val3;

void setup() {
  Serial.begin(115200);
  pinMode(sw1, INPUT_PULLUP);
  pinMode(sw2, INPUT_PULLUP);
  pinMode(sw3, INPUT_PULLUP);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() {
  val1 = digitalRead(sw1);
  val2 = digitalRead(sw2);
  val3 = digitalRead(sw3);
  Serial.print("sw1 = ");
  Serial.print("1");
  Serial.print(":sw2 = ");
  Serial.print("1");
  Serial.print(":sw3 = ");
  Serial.println("1");
  delay(50);
  if (val1 == 0) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
    delay(50);
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
  }
  if (val2 == 0) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, LOW);
    delay(50);
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
  }
  if (val3 == 0) {
    digitalWrite(led1, HIGH);
    digitalWrite(led2, HIGH);
    digitalWrite(led3, HIGH);
    delay(50);
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);
  }
}