f = open('INPUT.TXT')
n = int(f.readline().strip())
size = n * n

grid = []
for i in range(size):
    row = list(map(int, f.readline().split()))
    grid.append(row)
f.close()

valid_set = set(range(1, size + 1))
correct = True

for i in range(size):
    row_set = set(grid[i])
    if row_set != valid_set:
        correct = False
        break

if correct:
    for j in range(size):
        col_set = set()
        for i in range(size):
            col_set.add(grid[i][j])
        if col_set != valid_set:
            correct = False
            break

if correct:
    for block_row in range(n):
        for block_col in range(n):
            block_set = set()
            for i in range(n):
                for j in range(n):
                    row = block_row * n + i
                    col = block_col * n + j
                    block_set.add(grid[row][col])
            if block_set != valid_set:
                correct = False
                break
        if not correct:
            break

f = open('OUTPUT.TXT', 'w')
if correct:
    f.write('Correct')
else:
    f.write('Incorrect')
f.close()