#include<fstream>
using namespace std;
ifstream F("grupuri.in");
ofstream G("grupuri.out");
int n,m,i;
long long s,a[100001];
int main()
{
    for(F>>n>>m,i=1;i<=m;++i)
        F>>a[i],s+=a[i];
    for(;s/n<a[m];--m,--n)
        s-=a[m];
    G<<s/n;
    return 0;
}