int knop1 = 4;
int knop2 = 5;
int knop3 = 6;
int knop4 = 7;
int Reset= 10;
int led = 8; 
int status = LOW;
int laatsteStatus = LOW;
int ledStatus = LOW;
int statusknop1=LOW;
int statusknop2=LOW;
int statusknop3=LOW;
int statusknop4=LOW;

void setup() {
  pinMode(knop1, INPUT);
  pinMode(knop2, INPUT);
  pinMode(knop3, INPUT);
  pinMode(knop4, INPUT);
  pinMode(Reset, INPUT);
}

void loop() {

  if (digitalRead(Reset) == HIGH)
  {
    statusknop1 = LOW;
    statusknop2 = LOW;
    statusknop3 = LOW;
    statusknop4 = LOW;
  }

  if (digitalRead(knop1)== HIGH){
  statusknop1=(HIGH);
  }
    if (digitalRead(knop2)== HIGH){
  statusknop2=(HIGH);
  }
    if (digitalRead(knop3)== HIGH){
  statusknop3=(HIGH);
  }
    if (digitalRead(knop4)== HIGH){
  statusknop4=(HIGH);
  }
  if (statusknop1== HIGH&& statusknop2==HIGH&& statusknop3==HIGH&& statusknop4==HIGH){
    ledStatus= !ledStatus;
    digitalWrite(led, ledStatus);
  }
}