I'm starting to learn how to use Arduino and I tried to make this code, which is just a simple if else statement; what I want to make is when the input is LOW, LED 1 is HIGH and LEDs 2,3 are LOW, and when the input is HIGH, the LEDs 2,3 are HIGH and LED 1 is LOW. I wrote this code but when I put the switch in LOW, instead having just like what I intended, all the outputs are HIGH.

I try changing the output and I checked all the wiring to the LEDs so my mistake is in the code.

Could you guys tell me what's wrong with the code?

int switchstate = 0;
void setup() {
  pinMode (13,OUTPUT);
  pinMode(12,OUTPUT);
  pinMode(11,OUTPUT);
  pinMode(3,INPUT);
}

void loop() {
  switchstate = digitalRead(3);
  if (switchstate == LOW) {
    digitalWrite(11,HIGH);
    digitalWrite(12,LOW);
    digitalWrite(13,LOW);
  } else {
    digitalWrite(11,LOW);
    digitalWrite(12,HIGH);
    digitalWrite(13,HIGH);
  }
}