#include <bits/stdc++.h>
using namespace std;

int main() {
	int n, c, cnt = 0, eredmeny = 1e6;
    cin >> n >> c;
    vector<int> egok(n), szinek(c);
    for(int i = 0; i < n; i++) cin >> egok[i];
    int j = 0;
    for(j; cnt < c; j++) if(szinek[egok[j]]++ == 0) cnt++;
    eredmeny = j;
    j--;
    szinek[egok[0]]--;
    for(int i = 1; i < j; i++) {
        for(j; szinek[egok[i - 1]] == 0 && j < n; j++) szinek[egok[j]]++;
        if(szinek[egok[i - 1]] == 0) break;
        //cout << i << " " << j << " " << szinek[egok[i - 1]] << endl;
        eredmeny = min(eredmeny, j - i + 1);
        szinek[egok[i]]--;
    }
    cout << eredmeny << endl;
}