#include <bits/stdc++.h>
using namespace std;
int a[1000005];
int main()
{
    freopen("grupuri.in" , "r", stdin);
    freopen("grupuri.out" , "w", stdout);

    int k , n;
    scanf("%d %d\n", &k, &n);
    int lim = 0;
    for (int i = 1; i<=n; ++i)
    {
        scanf("%d", &a[i]);
        lim += a[i];
    }
    lim /= k;
    int st = 1 , dr = lim;
    for ( ; st <= dr; )
    {
        int mij = (st + dr) >> 1;
        int col = mij * k;
        for (int i = 1; i<=n; ++i)
            if (a[i] < mij)
                col -= a[i];
            else col -= mij;
        if (col <= 0)
            st = mij + 1;
        else dr = mij - 1;
    }
    printf("%d", dr);
    return 0;
}