#include <avr/io.h>
#include <util/delay.h>

#define F_CPU 20000000UL

int main()
{
  DDRB &= ~(1<<4);//INPUT
  DDRB |= (1<<5);//OUTPUT
while(1)
{
// PORTB = 0x20;_delay_ms(1000);PORTB = 0X00;_delay_ms(1000);

if(PINB & (1<<4))
PORTB |=(1<<5) ;

else
PORTB &=~(1<<5) ;

// _delay_ms(10);
}
}