#include <avr/io.h>   

int main(void) 
{	
    unsigned char mydata[] = {0x25,0x62,0x3F,0x52,0xE8};
    unsigned char chksum = 0;
    unsigned char x;
    DDRD = 0xFF;					
	for(x=0;x<5;x++)
      chksum = chksum + mydata[x];		
    if(chksum == 0)
      PORTD = 'G';
    else
      PORTD = 'B';

	return 0;
}