//=================================
// Created on: 2018/09/07 21:49:21
//=================================
#include <bits/stdc++.h>
#define show(x) std::cerr << #x << " = " << x << std::endl
using ll = long long;
using ull = unsigned long long;
using ld = long double;
constexpr ll MOD = 1000000007LL;
template <typename T>
constexpr T INF = std::numeric_limits<T>::max() / 10;
std::mt19937 mt{std::random_device{}()};
int main()
{
    int T, N;
    std::cin >> T >> N;
    std::vector<int> t(N);
    for (int i = 0; i < N; i++) { std::cin >> t[i]; }
    std::sort(t.begin(), t.end(), std::greater<int>{});
    auto check = [&](const int n) {
        std::priority_queue<int, std::vector<int>, std::greater<int>> q;
        for (int i = 0; i < n; i++) { q.push(0); }
        for (int i = 0; i < N; i++) {
            const int p = q.top();
            q.pop();
            q.push(p + t[i]);
        }
        while (not q.empty()) {
            if (q.top() > T) { return false; }
            q.pop();
        }
        return true;
    };
    int inf = 0, sup = N + 1;
    while (sup - inf > 1) {
        const int mid = (inf + sup) / 2;
        (check(mid) ? sup : inf) = mid;
    }
    std::cout << sup << std::endl;
    return 0;
}