int numblinks;
String msg="how many blinks do you want";
int bpin=13;
int j;
int bt=500;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(bpin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
Serial.println(msg);
while (Serial.available()==0){

}
numblinks=Serial.parseInt();
for (j=1;j<=numblinks;j=j+2){
digitalWrite(bpin, HIGH);
delay(bt);
digitalWrite(bpin, LOW);
delay(bt);
}
}