Servo myservo;

int pos = 0;
int button1 = D2;
int servloop = 0;

void setup() {

    myservo.attach(D1);
    myservo.write(30);
    pinMode(D5, OUTPUT);
    pinMode(button1, INPUT_PULLUP);
    Serial.begin(9600);
    Serial.println(servloop);
}

void loop() {
   Serial.println(servloop);

   if (servloop > 0) {
       servloop--;
  }

   if(digitalRead(button1) == LOW){
    while (servloop < 3) {
        myservo.write(0);
        digitalWrite(D5, HIGH);
        delay(1000);
        myservo.write(90);
        digitalWrite(D5, LOW);
        delay(1000);
        servloop ++;
    }

   }
}