#define IA 16807
#define IM 2147483647
#define AM (1.0/IM)
#define IQ 127773
#define IR 2836
#define MASK 123459876

static long idum;

void cheap_srand(long s) {
	idum = s;
}

float cheap_rand() {
	long k;
	float ans;
	idum ^= MASK;
	k=idum/IQ;		
	idum=IA*(idum-k*IQ)-IR*k;
	if (idum < 0) {
		idum += IM; 
	}
	ans=AM*idum; 
	idum ^= MASK;
	return ans;
}