#include <iostream>
#include <vector>
using namespace std;
vector<int> a;
vector<bool> used;
int take(int m) {
    int it = -1, ind = -1;
    for (int i = 0; i < a.size(); i++) {
        if (a[i] <= m && used[i]) {
            if (a[i] > it) {
                it = a[i];
                ind = i;
            }
        }
    }
    if (ind == -1) {
        return -1;
    } else {
        used[ind] = 0;
        return it;
    }
}

int main() {
    int m, n;
    cin >> m >> n;
    a.resize(n);
    used.resize(n, 1);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }
    int cnt = 0;
    while (1) {
            int w = m;
            int arms = 0;
        while(1) {
            int q = take(w);
            if (q == -1) {
                break;
            } else {
                w -= q;
                arms++;
            }
            if (arms == 2){
                break;
            }
        }
        if (arms == 0){
            break;
        }
        else {
            cnt++;
        }
    }
    cout << cnt;
}