#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int N,S; cin >> N >> S;
    vector<int> A(N);
    for(auto &a : A) cin >> a;
    sort(A.rbegin(),A.rend());

    int low = 0,high = 1001001001;
    while(high-low > 1){
        int mid = (high+low)/2;
        int left = S-1,hold = 0;
        for(auto a : A){
            if(a <= mid) continue;
            if(hold == 0 && left < a){left = -1; break;}
            if(hold == 0) hold = mid,left -= a;
            hold--;
        }
        if(left == -1) low = mid;
        else high = mid;
    }
    cout << high << endl;
}