std::ios::sync_with_stdio(false);

std::array<std::array<int, MAX_SUM_DIGITS + 1>, MAX_NUM_DIGITS + 1> numdigis_sumdigits_count{};

int required_sum_digits;

std::cin >> required_sum_digits;

for (int sum_digits = 1; sum_digits <= required_sum_digits; sum_digits++) {

if (sum_digits <= 9)

numdigis_sumdigits_count[1][sum_digits] = 1;

for (int num_digits = 2; num_digits <= MAX_NUM_DIGITS; num_digits++)

for (int additional_digit = 0; additional_digit <= 9; additional_digit++)

if (sum_digits - additional_digit >= 0) {

numdigis_sumdigits_count[num_digits][sum_digits] +=

numdigis_sumdigits_count[num_digits - 1][sum_digits - additional_digit];

}

}

int full_num_digits = 0;

for (int num_digits = 1; num_digits <= MAX_NUM_DIGITS; num_digits++)

full_num_digits += numdigis_sumdigits_count[num_digits][required_sum_digits];

if (required_sum_digits == 1) // count 10**9

full_num_digits++;

std::cout << full_num_digits;

return 0;