Simple Multitask with millis function

#define LED1 2
#define LED2 4
#define LED3 6
#define delay1 100
#define delay2 200
#define delay3 300
int state1=0,state2=0,state3=0;
unsigned long timer1,timer2,timer3;
void setup(){
 pinMode(LED1,OUTPUT);
 pinMode(LED2,OUTPUT);
 pinMode(LED3,OUTPUT);
 timer1=millis();
 timer2=millis();
 timer3=millis();
}
void loop(){
 if((millis()-timer1)>delay1){
    digitalWrite(LED1, (state1) ? HIGH : LOW);
    state1=!state1;
    timer1=millis();
 }
 if((millis()-timer2)>delay2){
    digitalWrite(LED2, (state2) ? HIGH : LOW);
    state2=!state2;
    timer2=millis();
 }
 if((millis()-timer3)>delay3){
    digitalWrite(LED3, (state3) ? HIGH : LOW);
    state3=!state3;
    timer3=millis();
 }
}