#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long 
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define eb emplace_back
#define int ll 

using namespace std;

const string FILE_NAME = "grupuri";

int n, k;
vector<int> a;

bool verify(int number) {
    int sum = 0;
    for (int i = 1; i <= n; i++)
        sum += min(number, a[i]);
    return sum >= number * k;
}

signed main() {
    #ifndef TEST 
        freopen(FILE_NAME + ".in", "r", stdin);
        freopen(FILE_NAME + ".out", "w", stdout);
    #endif
    ios_base :: sync_with_stdio(false);
    cin.tie(nullptr), cout.tie(nullptr);
    
    cin >> k >> n;
    a.resize(n + 1);
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    int ans = 0, left = 1, right = n;
    while (left <= right) {
        int middle = (left + right) / 2;
        if (verify(middle)) {
            ans = middle;
            left = middle + 1;
        }
        else
            right = middle - 1;
    }
    cout << ans;
    return 0;
}