#include <iostream>

int digit_count(int n)
{
    if (n <= 9)
        return 1;

    int count = 0;

    while (n > 0)
    {
        n /= 10;
        count++;
    }

    return count;
}

int digit_at(int n, int index)
{
    int dig_count = digit_count(n);

    while (dig_count > index+1)
    {
        n /= 10;
        dig_count--;
    }

    return n % 10;
}

int main() {
    int n;
    std::cin >> n;

    int total_digit_count = 0;

    for (int i = 1; i <= n; i++)
    {
        total_digit_count += digit_count(i);

        if (total_digit_count == n)
        {
            std::cout << i % 10;
            break;
        }
        else if (total_digit_count > n)
        {
            std::cout << digit_at(i, total_digit_count - n - 1);
            break;
        }
    }
}