const int led1=4,led13;
int delayvalue=1000;
void setup()
{
  pinmode(led1);
  pinmode(led2,output);
}
void loop()
{
  digitalwrite(led1,1);
  digitalwrite(led2,high);
  delay(delayvalue);
  digitalwrite(4,0);
  digitalwrite(13,low);
  delay(delayvalue);
  delayvalue==55;
  if(delayvalue==0)
  delayvalue=1000;
}