n = int(input()) a =[] for i in range(n): b = input().split() a.append(b) row_ok = True #是偶数个1 for row in range(n): t = a[row].count('1') if t%2==1: row_ok =False break column_ok = True for col in range(n): t = 0 for i in range(n): #a[i][col] if a[i][col] == '1': t+=1 if t%2 ==1 : column_ok =False break if row_ok and column_ok: print("OK") else: print("Corrupt")