#include<iostream>
#include<cstring>
#include<vector>
using namespace std;
using LL = long long;

int main(){

#ifdef LOCAL
    freopen("data.in", "r", stdin);
    freopen("data.out", "w", stdout);
#endif

    cin.tie(0);
    cout.tie(0);
    ios::sync_with_stdio(0);

    int n, m;
    cin >> n >> m;
    int cnt[13]{};
    for(int i = 0; i < n; i++){
        int x;
        cin >> x;
        cnt[x - 1] += 1;
    }
    vector<int> f(1 << 13, 100);
    f[0] = 0;
    for(int i = 1; i < 1 << 13; i++){
        int sum = 0;
        for(int j = 0; j < 13; j++){
            if (i >> j & 1){
                sum += cnt[j];
            }
        }
        if (sum <= m) f[i] = 1;
    }
    for(int i = 1; i < 1 << 13; i++){
        for(int j = i; j; j = (j - 1) & i){
            f[i] = min(f[i], f[j] + f[i ^ j]);
        }
    }
    cout << f.back() << '\n';

}