int ledpin = 7;
int ledpin2 = 6;
int ledpin3 = 5;
int buttonpin = 9;

int buttonOld = 0;
int buttonNew = 0;

int state = 0;   // 0=OFF, 1=ON, 2=OFF, 3=ON, etc.
int dt = 200;    // debounce delay

void setup() {
  pinMode(ledpin, OUTPUT);
  pinMode(ledpin2, OUTPUT);
  pinMode(ledpin3, OUTPUT);
  pinMode(buttonpin, INPUT_PULLUP); // safer, uses pull-up resistor
}

void loop() {
  buttonNew = digitalRead(buttonpin);

  // detect rising edge (button pressed)
  if (buttonOld == HIGH && buttonNew == LOW) {
    state++;                // go to next state
    if (state > 3) state = 0; // reset after 3
    delay(dt);              // debounce
  }
  buttonOld = buttonNew;

  // control LED based on state
  if (state == 0) {
    digitalWrite(ledpin, LOW);   // OFF
    digitalWrite(ledpin2, LOW);
    digitalWrite(ledpin3, LOW);
  }
  else if (state == 1) {
    digitalWrite(ledpin, HIGH);  // ON
    digitalWrite(ledpin2, LOW);
    digitalWrite(ledpin3, LOW);
  }
  else if (state == 2) {
    digitalWrite(ledpin, LOW);   // OFF
    digitalWrite(ledpin2, HIGH);
  }
  else if (state == 3) {
    digitalWrite(ledpin, LOW);
    digitalWrite(ledpin2, LOW);
    digitalWrite(ledpin3, HIGH);  // ON
  }
}