int LED_red = 13;
int LED_yellow = 12;
int LED_green = 11;
int LED_blue = 10;
int Switch_red = 4;
int Switch_yellow = 3;
int Switch_green = 2;
int Switch_blue = 1;



void setup() {
  // put your setup code here, to run once:


  pinMode(LED_red, OUTPUT);
  pinMode(LED_yellow, OUTPUT);
  pinMode(LED_green, OUTPUT);
  pinMode(LED_blue, OUTPUT);
  pinMode(Switch_red, INPUT_PULLUP);
  pinMode(Switch_yellow, INPUT_PULLUP);
  pinMode(Switch_green, INPUT_PULLUP);
  pinMode(Switch_blue, INPUT_PULLUP);
}


void loop() {
  // put your main code here, to run repeatedly:

  if (digitalRead(Switch_red) == LOW){
    digitalWrite(LED_red, HIGH);
  }
  else {
    digitalWrite(LED_red, LOW);
  }

  if (digitalRead(Switch_yellow) == LOW){
    digitalWrite(LED_yellow, HIGH);
  }
  else {
    digitalWrite(LED_yellow, LOW);
  }

  if (digitalRead(Switch_green) == LOW){
    digitalWrite(LED_green, HIGH);
  }
  else {
    digitalWrite(LED_green, LOW);
  }

  if (digitalRead(Switch_blue) == LOW){
    digitalWrite(LED_blue, HIGH);
  }
  else {
    digitalWrite(LED_blue, LOW);
  }
}