int isPressed = 0;
int butNum = 0;

void setup() {

pinMode(2,INPUT);
pinMode(8, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);



}

void loop() {

isPressed = digitalRead(2);

if (isPressed == HIGH){

  butNum +=1;  
  
}

if (butNum == 1){
  
  digitalWrite(8, HIGH);
  digitalWrite(9, LOW);
  digitalWrite(10, LOW);


}

if (butNum == 2){
  
  digitalWrite(8, LOW);
  digitalWrite(9, HIGH);
  digitalWrite(10, LOW);
  
}
if (butNum == 3){
  
  digitalWrite(8, LOW);
  digitalWrite(9, LOW);
  digitalWrite(10, HIGH);
  
}

if (butNum == 4){

  butNum = 1;

}
}