#define R 3
#define G 6
#define B 5
#define button 7
boolean button_state;
boolean flag = false;
int klik = 0;

void setup() {
  pinMode(R, OUTPUT);
  pinMode(G, OUTPUT);
  pinMode(B, OUTPUT);
  pinMode(button, INPUT);
  Serial.begin(9600);
}

void loop() {
  button_state = digitalRead(button);
  if (button_state == true && flag == false) { 
    flag = true;
    Serial.println("кнопка нажата");
    delay(50);
  }
  if (button_state == false && flag == true) {
    flag = false;
    Serial.println("кнопка отпущена");
    delay(50);
    klik++;
    Serial.println(klik);
  }
  if(klik%2==0 || klik==0){
    digitalWrite(R, LOW);
  }else{
    digitalWrite(R, HIGH);
  }
}