#define F_CPU 1000000UL
#include <avr/io.h>
#include <util/delay.h>

int main(void){
	while(1){
		for (int i = 1; i<=125; i++) {
			PORTD = 0b00000000;
			_delay_ms(1);
			PORTD = 0b10000000;
			_delay_ms(1);
		}
		PORTD = 0b00000000;
		_delay_ms(250);
		for (int i = 1; i<=375; i++) {
			PORTD = 0b00000000;
			_delay_ms(1);
			PORTD = 0b10000000;
			_delay_ms(1);
		}
		PORTD = 0b00000000;
		_delay_ms(750);
	}
return 0;
}