Light on off 8

#include <IRremote.h>

#define first_key 16724175
#define second_key 16718055
#define third_key 16743045
#define fourth_key 16716015
int receiver_pin = 11;

int first_led_pin = 13;
int second_led_pin = 12;
int third_led_pin = 10;
int fourth_led_pin = 7;

int led[] = {0,0,0,0};
IRrecv receiver(receiver_pin);
decode_results output;

void setup()
{
  Serial.begin(9600);
  receiver.enableIRIn();
  pinMode(first_led_pin, OUTPUT);
  pinMode(second_led_pin, OUTPUT);
  pinMode(third_led_pin, OUTPUT);
  pinMode(fourth_led_pin, OUTPUT);
  }

void loop() {
  if (receiver.decode(&output)) {
    unsigned int value = output.value;
    switch(value) {
       case first_key:
         if(led[1] == 1) {
            digitalWrite(first_led_pin, LOW);
            led[1] = 0;
         } else {
             digitalWrite(first_led_pin, HIGH);
             led[1] = 1;
         }
          break;
       case second_key:

         if(led[2] == 1) {
            digitalWrite(second_led_pin, LOW);
            led[2] = 0;
         } else {
             digitalWrite(second_led_pin, HIGH);
             led[2] = 1;
         }
          break;
       case third_key:

         if(led[3] == 1) {
            digitalWrite(third_led_pin, LOW);
            led[3] = 0;
         } else {
             digitalWrite(third_led_pin, HIGH);
             led[3] = 1;
         }
          break;
          case fourth_key:

         if(led[4] == 1) {
            digitalWrite(fourth_led_pin, LOW);
            led[4] = 0;
         } else {
             digitalWrite(fourth_led_pin, HIGH);
             led[4] = 1;
         }
          break;
    }
    Serial.println(value);
    receiver.resume();
  }
}