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#include<bits/stdc++.h>
using namespace std;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n,k;
    cin>>n>>k;

    int S = (n*(n+1))/2;
    vector<int> roczniki(S,0);
    int remains = 1, current = 1;
    int pole, minimal = 2020;
    for(int i = 0; i < S; i++)
    {
        pole = remains * (current - remains + 1);
        cin>>roczniki[i];
        if(pole <= k)
        {
            minimal = min(minimal,roczniki[i]);
        }
        remains--;
        if(remains == 0)
        {
            current++;
            remains = current;
        }
    }
    cout<<minimal<<endl;
}