int P;
String Msg1 = "por favor ingresa el numero de parpadeos";
int ledpin = 4;
int dt = 500;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(led pin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
Serial.println(Msg1);
while (Serial.available()== 0){
}
P = Serial.parseInt();
for (i=1; i<=P; i=++){
  digitalWrite(ledpin, HIGH);
  delay(dt);
  digitalWrite(ledpin, LOW);
  delay(dt);
}

}