#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef pair<ll,ll> P;
typedef vector<ll> VI;
typedef vector<VI> VVI;
#define REP(i,n) for(ll i=0;i<(n);i++)
#define ALL(v) v.begin(),v.end()
template<typename T> bool chmax(T &x, const T &y) {return (x<y)?(x=y,true):false;};
template<typename T> bool chmin(T &x, const T &y) {return (x>y)?(x=y,true):false;};
constexpr ll MOD=998244353;
constexpr ll INF=2e18;

int main(){
    int n, m; cin >> n >> m;
    VI a(n); REP(i,n) cin >> a[i];
    int l=0, r=1e9+10;
    while(r-l>1){
        int x=(l+r)/2;
        ll k=0;
        REP(i,n){
            if(a[i]>x)
                k+=a[i]-x;
            else
                k-=x-a[i];
            if(k<0)
                break;
        }
        if(k<0)
            r=x;
        else
            l=x;
    }
    cout << l/m << endl;
    return 0;
}