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#include <iostream>
using namespace std;
int main () {
    ios_base::sync_with_stdio(0);
    int n, k, tmp, minn=2020, i1=1,i2=1,i3=1;
    cin >> n >> k;
    for (i1;i1<=((n*(n+1))/2);i1++) {
        cin >> tmp;
        if (tmp<minn && i3*(i2-i3+1)<=k) minn=tmp;
        if (i2==i3) {
            i2++;
            i3=1;
        } else i3++;
    }
    cout << minn << endl;
return 0; }