int numBlinks;
int redPin=10;
int delayt=500;
int j;
String msg="how many blinks you want?";
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(redPin, OUTPUT);
}

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

}
numBlinks=Serial.parseInt();
j=1;
for(j=1;j<=numBlinks;j=j+1){
  digitalWrite(redPin, HIGH);
  delay(delayt);
  digitalWrite(redPin, LOW);
  delay(delayt);
}
}