cses_1620

#include <bits/stdc++.h>

#define loop(x, n) for (ll i = x; i < n; i++)
#define joop(x, n) for (ll j = x; j < n; j++)
#define pb push_back
#define all(x) x.begin(), x.end()
#define sz(x) x.size()
#define f first
#define s second
#define table(x) for (auto i : x) { for (auto j : i) {cout << j << " ";}cout << '\n';}
#define mod 1000000007
#define pii pair<int, int>
#define piic pair<int, pair<int, int>>
#define mp make_pair
#define inf 1000000000
//# define DEBUG 1

using namespace std;
typedef long long ll;


ll bp(vector<ll> & arr, ll value){
//    cout << value << " ";
    ll l = 0;
    ll r = 1e18;
    ll ans = 0;
    while(l < r){
        ll m = (l+r)/2;
        ll s = 0;

        loop(0, sz(arr)){
            s += m/arr[i];
            if(s >= value){
                break;
            }
        }

        if(s >= value){
            r = m;
            ans = m;
        }else{
            l = m+1;
        }
    }
    return l;
}

void solve() {
    int n, m;
    cin >> n >> m;
    vector<ll> c(n);
    ll minn = 1e9;
    loop(0, n){
        cin >> c[i];
        minn = min(minn, c[i]);
    }



    cout <<  bp(c, m) ;


}

int main() {
#ifdef DEBUG
    freopen("text.txt", "r", stdin);
#else
#endif
    solve();
    return 0;