int led1=2;
int led2=3;
int led3=4;
int tipkalo=5;


void setup() {
  // put your setup code here, to run once:
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(tipkalo, INPUT_PULLUP);
digitalWrite(led1, LOW);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);

}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(led1, HIGH); 
delay(500);
digitalWrite(led1, LOW);
digitalWrite(led2, HIGH);
delay(500);
digitalWrite(led2, LOW);
digitalWrite(led3, HIGH);
delay(500);
digitalWrite(led3, LOW);
    
 do
  {
    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);

  }
while(digitalRead(tipkalo)==LOW);
}