#define botao 7
#define led 13

void setup() {
  pinMode(botao, INPUT_PULLUP);
  pinMode(led, OUTPUT);
}

void loop() {
 if (digitalRead(botao) == LOW)
 {
  for (int x=0; x<3; x++)
  {
    digitalWrite(led, HIGH);
    delay(1000);
    digitalWrite(led, LOW);
    delay(300);
  }
 }
}