#include <iostream>
#include <vector>
#include <set>
#include <limits.h>

using namespace std;

bool check(int c, set<int> colors) {
    for (int i = 0; i < c; i++) {
        if (colors.count(i) == 0) {
            return 0;
        }
    }
    return 1;
}

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

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

    set<int> colors;
    int minPOSlength = n;
    for (i = 0; i < n-c; i++) {
        int length = 1, start = lights[i], j = i+1;
        colors.insert(start);
        while (!check(c, colors) && j != n) {
            colors.insert(lights[j]);
            j++, length++;
        }
        if (length < minPOSlength && length >= c && check(c, colors)) {
            minPOSlength = length;
        }
        if (minPOSlength == c) {
            break;
        }
        colors.clear();
    }
    cout << minPOSlength;
}