#include <iostream>
#include <vector>
#include <set>

using namespace std;

int main()
{
    int n, c, i, out = INT_MAX;
	cin >> n >> c;

    vector<int> leds(n);

	for (i = 0; i < n; i++)
	{
		cin >> leds[i];
	}

	vector<int> colors(c, 0);
	set<int> present;

	int back = 0;
	i = 0;

	while (i < n)
	{
		while (present.size() < c && i < n)
		{
			colors[leds[i]]++;
			present.insert(leds[i]);
			i++;
		}

		while (present.size() == c)
		{
			if (out > i - back)
			{
				out = i - back;
			}
			
			if (--colors[leds[back]] == 0)
			{
				present.erase(leds[back]);
			}

			back++;
		}

	}

	cout << out;
}
//10 4
//0 1 3 0 0 1 2 0 2 3