#define SEED 1753

static unsigned long seed = SEED;
static unsigned long call =1;

unsigned long
rand(void)
{

		if ((seed % 2) > 0) 
		{
			seed ^= call;
			seed >>= 1;
			seed |= 0x80000000;
		} 
		else 
		{
			seed ^= ~call;
			seed >>= 1;
		}						
	call++;
	return seed;
}