results=[] n=int(input()) for x in range(n): a=list(map(int,input().split())) results.append(a) flag=True for row in results: tot=0 for x in row: if x==1: tot=tot+1 if tot%2==1: flag=False break if flag: for col in range(n): cnt=0 for row in range(n): if results[row][col]==1: cnt=cnt+1 if cnt%2==1: flag=False break if flag: print("OK") else: print("Corrupt")