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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("grupuri.in");
ofstream fout("grupuri.out");
long long n, k, a[100001];
int main()
{
fin >> k >> n;
for(int i = 1; i <= n; i++){
fin >> a[i];
}
long long st = 1;
long long dr = 100000000005;
long long sol = 0;
while(st <= dr){
long long mij = (st + dr) / 2;
long long sum = 0;
for(int i = 1; i <= n; i++){
sum += min(a[i], k);
}
if(sum >= mij * k){
sol = mij;
st = mij + 1;
}
else{
dr = mij - 1;
}
}
fout << sol;
return 0;
}