int led1 = 17;
int led2 = 5;
int led3 = 18;
int led4 = 19;
int sw1 = 16;
int sw2 = 4;

void setup() {
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(sw1, INPUT);
  pinMode(sw2, INPUT);
}

void loop() {
  if (digitalRead(sw1) == HIGH) {
    digitalWrite(led1, 1);
    delay(800);
    digitalWrite(led1, 0);
    digitalWrite(led2, 1);
    delay(800);
    digitalWrite(led2, 0);
    digitalWrite(led3, 1);
    delay(800);
    digitalWrite(led3, 0);
    digitalWrite(led4, 1);
    delay(800);
    digitalWrite(led4, 0);
    delay(800);
  } 
  if (digitalRead(sw2) == HIGH) {
    digitalWrite(led4, 1);
    delay(800);
    digitalWrite(led4, 0);
    digitalWrite(led3, 1);
    delay(800);
    digitalWrite(led3, 0);
    digitalWrite(led2, 1);
    delay(800);
    digitalWrite(led2, 0);
    digitalWrite(led1, 1);
    delay(800);
    digitalWrite(led1, 0);
    delay(800);
  } 
  if(digitalRead(sw1) && digitalRead(sw2) == 0){
    digitalWrite(led1, 0);
    digitalWrite(led2, 0);
    digitalWrite(led3, 0);
    digitalWrite(led4, 0);
  }
}