n=int(input()) a=[] for x in range(n): tmp=list(map(int,input().split())) a.append(tmp) flag=True for ooo in a: if ooo.count("1")%2==1: flag=False break if flag: for col in a: if col.count("1")%2==1: flag=False break if flag: print("OK") else: print("Corrupt")