const int ButtonR = 4;
const int ButtonG = 3;
const int ButtonB = 2;
const int LedR = 7;
const int LedG = 6;
const int LedB = 5;


void setup() {
  pinMode(ButtonR, INPUT_PULLUP);
  pinMode(ButtonG, INPUT_PULLUP);
  pinMode(ButtonB, INPUT_PULLUP);

}

void loop() {
  if (digitalRead(ButtonR) == LOW){
    if (digitalRead(LedR) == LOW){
      digitalWrite(LedR, HIGH);
      analogWrite(LedR, 255);
      analogWrite(LedG, 0);
      analogWrite(LedB, 0);
    }else{
      digitalWrite(LedR, LOW);
    }
  }else if(digitalRead(ButtonG) == LOW){
    if (digitalRead(LedG) == LOW){
      digitalWrite(LedG, HIGH);
      analogWrite(LedR, 0);
      analogWrite(LedG, 255);
      analogWrite(LedB, 0);
    }else{
      digitalWrite(LedG, LOW);
    }
  }else if(digitalRead(ButtonB) == LOW){
    if (digitalRead(LedB) == LOW){
      digitalWrite(LedB, HIGH);
      analogWrite(LedR, 0);
      analogWrite(LedG, 0);
      analogWrite(LedB, 255);
    }else{
      digitalWrite(LedB, LOW);
    }
  }
}