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

int main(void)
{
	DDRB  |= _BV(0)|_BV(1);
        PORTB |= _BV(0);
	PORTB &= ~_BV(1);
	DDRD  &= ~_BV(0);
	PORTD |=  _BV(0);

	unsigned char i,n;

	while (1) 
	{
		PORTB ^=_BV(0);
		PORTB ^=_BV(1);
		
		n = (PIND & _BV(0))? 100: 20; 

		for (i = 0; i < n; i++)
			         _delay_ms(10);
	}
	return 0;
}