#include <avr/io.h>

#ifndef _BV
#define _BV(x) (1 << x)
#endif

#define F_CPU 16000000

int main(void){
  DDRD |= _BV(6);
  DDRD &= ~_BV(5);

  while(1){
    
    if(PIND & _BV(5)){
      PORTD |= _BV(6);
    } else {
      PORTD &= ~_BV(6);
    }
  }
  return 0;
}