n=int(input()) a=[] for x in range(n): tmp=input().split() a.append(tmp) flag=True for row in a: if row.count("1")%2==1: flag=False break if flag: for y in range(n): cnt=0 for row in range(n): if a[row][y]=="1": cnt+=1 if cnt%2==1: flag=False break if flag==True: print("OK") else: print("Corrupt")