n = int(input())
A = []
B = [str(i + 1) for i in range(n**2)]
for i in range(n * n):
    A.append(list(map(str,input().split())))
correct = True


for row in A:
    if not correct:
        break
    s = ''.join(row)
    for i in range(1, n * n + 1):
        if s.count(str(i)) == 0:
            correct = False
            break
        else:
            s = s.replace(str(i),'')
    if len(s) != 0:
        correct = False
        break

for i in range(0,n**2,n):
    if not correct:
        break
    for j in range(0,n**2,n):
        C = []
        for g in range(n):
            for k in range(n):
                C.append(A[i+g][j+k])
        if sorted(C) != B:
            correct = False
            break


if correct:
    print('Correct')
else:
    print('Incorrect')