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#include <iostream>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    unsigned int n, k;
    short int chsn1=2020, foo;
    cin >> n >> k;
    for (int i=1; n>=i; i++){
        for (int j=0; j<i; j++){
            cin >> foo;
            if (k>=(i-j)*(j+1)&&foo<chsn1) chsn1=foo;
        }
    }
    cout << chsn1 << endl;
    return 0;
}