#include <avr/io.h> 
#include <util/delay.h> 
int main() { 
  init();
  /* set PORTB BIT IN PIN 13 as output */
  DDRB |= 0x20;// DDRB5 pin 13 as output
  byte bit5 = 1 << 5;//set bit 5 to 1 by shifting 1, 5 times
  while (true) { 
    PORTB |= bit5;//HIGH write 1
    _delay_ms(1000); 
    PORTB &= ~bit5;//LOW write 0 
    _delay_ms(1000); 
  } 
  return 0; 
}