#15596

#include <iostream>
#include <vector>
using namespace std;
long long sum(vector<int> &a) {
	long long ans = 0;
    for (int i = 0; i < a.size(); i++)
	{
		ans += a[i];
	}
	return ans;
}

#4673

#include <iostream>
using namespace std;

int d(int n) { //생성자가 있는 셀프넘버
	int sum = n;

	while (n > 0)
	{
		sum = sum + n % 10;
		n /= 10;
	}
	return sum;
}

int main()
{
	int data[10001] = {0};
	int X;

	for (int i = 1; i < 10001; i++)
	{
		X = d(i);
		if (X < 10001)
		{
			data[X] = 1;
		}
	}

	for (int i = 1; i < 10001; i++)
	{
		if (data[i] != 1)
		{
			cout << i << "\n";
		}
	}
}

#1065

#include <iostream>
using namespace std;

int hansu(int m)
{
	int x, y, z = 0;
	int cnt = 0;

	for (int i = 100; i <= m; i++) {

		x = i / 100; //백의자리
		y = (i % 100) / 10; //십의자리
		z = (i % 100) % 10; //일의자리

		if (x - y == y - z)
		{
			cnt++;
		}
	}

	return cnt;
}

int main()
{
	int N, result;
	cin >> N;

	if (N > 1000)
		return 0;

	if (N < 100)
	{
		cout << N;
	}
	else
	{
		result = hansu(N);
		cout << result + 99;
	}

	return 0;
}