int redled=4;
bool redledstatus=HIGH;
int blueled=4;
bool blueledstatus=HIGH;
int green led=4;
bool greenledstatus=HIGH;
int yellowled=4;
bool yellowledstatus=HIGH;
long lasttime0=0;
long lasttime1=0;
long lasttime2=0;
long lasttime3=0;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(redled,OUTPUT);
pinMode(blueled,OUTPUT);
pinMode(greenled, OUTPUT);
pinMode(yellowled, OUTPUT);
}

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

}
if(ab(lasttime-millis()) >500)
{
  Serial print("im 1 st if loop")
  if(redledstwtus==HIGH)
  {
  if(redledstwtus==HIGH)
   digitalWrite(redled, LOW);
   redledstatus=HIGH ;
   {
    else if(redledstatus,LOW)
    {
    digitalWrite(redled, HIGH);
    redledstatus =LOW;
    }
    lastrime0=millis();
   }
}
if(ab(lasttime-millis()) >1500)
{
  if(blueedstwtus==HIGH)
  {
   digitalWrite(redled, LOW);
   blueledstatus=HIGH ;
   {
    else if(redledstatus,LOW)
    digitalWrite(redled, HIGH);
    blueledstatus =LOW;
    }
    lastrime1=millis();
   }
   }
if(ab(lasttime-millis()) >3000)
{
  if(greenledstwtus==HIGH)
  {
   digitalWrite(redled, LOW);
   greenledstatus=HIGH ;
   {
    else if(greenledstatus,LOW)
    digitalWrite(redled, HIGH);
    greenledstatus =LOW;
    }
    lastrime2=millis();
   }
   }
if(ab(lasttime-millis()) >5000)
{
  if(yellowledstwtus==HIGH)
  {
   digitalWrite(redled, LOW);
   yellowledstatus=HIGH ;
   {
    else if(yellow ledstatus,LOW)
    digitalWrite(redled, HIGH);
    yellowledstatus =LOW;
    }
    lastrime3=millis();
   }
   }