inline int nmv(int val) { return val < 0 || (val > (1 << (fn-1)))? 0 : val; }
inline void check(FP c) {
	if(memcmp(f+(fc*fn)+fr, &(fs = (nmv((1L << (fr+1))) | nmv((1L << ((fr+1) >> (fc-c)))) | nmv((1L << ((fr+1) >> (fc+c)))))), fn) == 0) {
		// Is safe :P
	}

}