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#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    
    int n, k;
    
    cin >> n >> k;
    
    int minimum = 2020;
    
    for (int row=1; row<=n; row++) {
        for (int col=0; col<row; col++) {
            int a;
            cin >> a;
            
            if (a < minimum && (col + 1) * (row - col) <= k) {
                minimum = a;
            }
        }
    }
    
    cout << minimum << '\n';
    
    return 0;
}