matrix

def max_neighbor_sum(matrix):
    max_sum = float('-inf')
    rows = len(matrix)
    cols = max(len(row) for row in matrix)

    for i in range(rows - 1):
        for j in range(cols - 1):

            if i + 1 < rows and j + 1 < len(matrix[i]) and j + 1 < len(matrix[i + 1]):

                current_sum = (
                    matrix[i][j] + matrix[i + 1][j] +
                    matrix[i][j + 1] + matrix[i + 1][j + 1]
                )

                if current_sum > max_sum:
                    max_sum = current_sum

    return max_sum


input_matrix = [
    [1, 2, 200],
    [4],
    [5, 6],
    [7, 8, 9, 10],
    [1, 5],
    [12, 2, 3, 5, 5]
]

result = max_neighbor_sum(input_matrix)
print("Най-голямата сума на съседни точки в матрицата е:", result)