void setup() {
 Serial.begin(9600);
 pinMode(6, OUTPUT);
 pinMode(2, OUTPUT);
 pinMode(3, OUTPUT);
 pinMode(4, OUTPUT);
 pinMode(5,INPUT_PULLUP);
 
}
void loop() {
  // int_fast8_t num=0;
  uint8_t led=0; 
  while (1){
    if(digitalRead(5)==0){
      while(digitalRead(5)==1);
      led^=1;
      delay(5);
      digitalWrite(5, LOW);
    }
      delay(10);
     digitalWrite(6,led);
     delay(50);
     digitalWrite(2,led);
     delay(100);
     digitalWrite(3,led);
     delay(150);
     digitalWrite(4,led); 
      
   
  }
}