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#include <iostream>

using namespace std;

int b[2000]{0};

int main() {

	ios_base::sync_with_stdio(false);
	cin.tie(NULL);

	int N, K;
	cin >> N >> K;

	int min_y = 2019;

	for (int i = 1; i <= K; i++) {
		for (int j = 0; j < i; j++) {
			b[j] += j+1;

			int y;
			cin >> y;
			if (b[j] <= K && min_y > y)
				min_y = y;
		}
	}

	cout << min_y << "\n";

	return 0;
}