int led1 = 3;
int led2 = 4;
int led3 = 5;
int pb1 = 7;
int pb2 = 11;

void setup() {
pinMode (led1, OUTPUT);
pinMode (led2, OUTPUT);
pinMode (led3, OUTPUT);
pinMode (pb1, INPUT);
pinMode (pb2, INPUT);
}

void loop() {
if (digitalRead(pb1) == HIGH) {
  digitalWrite (led1, HIGH);
  delay (1000);
  digitalWrite (led1, LOW);

  digitalWrite (led2, HIGH);
  delay (1000);
  digitalWrite (led2, LOW);

  digitalWrite (led3, HIGH);
  delay (1000);
  digitalWrite (led3, LOW);

} if (digitalRead(pb2) == HIGH) {
  digitalWrite (led3, HIGH);
  delay (1000);
  digitalWrite (led3, LOW);

  digitalWrite (led2, HIGH);
  delay (1000);
  digitalWrite (led2, LOW);

  digitalWrite (led1, HIGH);
  delay (1000);
  digitalWrite (led1, LOW);

} else {
  digitalWrite (led1, LOW);
  digitalWrite (led2, LOW);
  digitalWrite (led3, LOW);
}








/*digitalWrite (3, HIGH);
delay (500);
digitalWrite (3, LOW);
delay (1000);*/
}