Arduino RandomLED

int btn1 = 2;
int btn2 = 4;
int btn3 = 6;

int led1 = 3;
int led2 = 5;
int led3 = 7;
int led = 0; // random værdi
int rdm = 0; //random værdi


void setup() {
  Serial.begin(9600);

    pinMode(btn1, INPUT_PULLUP);
  pinMode(btn2, INPUT_PULLUP);
  pinMode(btn3, INPUT_PULLUP);

  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);

  randomSeed(analogRead(0));
}

void loop() {

  rdm = random(3,8);

  if(rdm == led){ // check om at den samme LED ikke lyser igen
  led = random(3,8);
  }
  else{
  led = rdm;
  }

    if(led % 2 == 0){
      led = led + 1;
    }
  delay(200);

    while(digitalRead(led - 1) == HIGH) {
      delay(200);
      digitalWrite(led,HIGH);
      delay(200);
      }
Serial.print(" knap: ");
Serial.println(digitalRead(led -1));
delay(200);
digitalWrite(led,LOW);
  }

  void newLight(int knapval, int ledval) {

  }