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#include <cstdio>

int main() {
	int n, k;
	scanf("%d%d", &n, &k);
	int aMin = 2020;
	for(int i = 1; i <= n; ++i) {
		for(int j = 1; j <= i; ++j) {
			int a;
			scanf("%d", &a);
			if(j * (i-j+1) <= k && a < aMin) {
				aMin = a;
			}
		}
	}
	printf("%d\n", aMin);
	return 0;
}