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#include <iostream>

using namespace std;

typedef long long int lint;

int main() {
    ios_base::sync_with_stdio(false);
    lint n, k; cin >> n >> k;
    int best = 1000000;
    for (lint r = 1; r <= n; ++r) {
        for (lint c = 1; c <= r; ++c) {
            int year; cin >> year;
            lint required = (r + 1 - c) * c;
            //cout << required << (c == r ? "\n" : " ");
            if (required <= k && year < best) {
                best = year;
            }
        }
    }
    cout << best << endl;

    return 0;
}