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

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

# нужные числа
need = set(range(1, size + 1))

ok = True

# проверка строк
for i in range(size):
    if set(table[i]) != need:
        ok = False

# проверка столбцов
for j in range(size):
    col = []
    for i in range(size):
        col.append(table[i][j])
    if set(col) != need:
        ok = False

# проверка соседей
for bi in range(n):
    for bj in range(n):
        block = []
        for i in range(n):
            for j in range(n):
                block.append(table[bi * n + i][bj * n + j])
        if set(block) != need:
            ok = False

out = open("OUTPUT.TXT", "w")
if ok:
    out.write("Correct\n")
else:
    out.write("Incorrect\n")
out.close()