int redpin=7;
int greenpin=6;
int bluepin=5;
String msg="number of time  you want to blink the led";
int NumOfBlink;
int i;
void setup() {
  // put your setup code here, to run once:
  pinMode(redpin, OUTPUT);
  pinMode(greenpin, OUTPUT);
  pinMode(bluepin, OUTPUT);
  Serial.begin(9600);

}

void loop() {
  // put your main code here, to run repeatedly:
Serial.print(msg);
NumOfBlink=Serial.parseInt();//taking integer by serial monitor
while(Serial.available()==0){
  //hold the serial monitor until input is written
}
for(i=1; i<=NumOfBlink;i++){
  digitalWrite(redpin, HIGH);
  
  digitalWrite(greenpin, HIGH);
  digitalWrite(bluepin, HIGH);
}
}