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#include <cstdio>

int n,k, wyn = 2019, pom;

int main() {
	scanf("%d%d", &n, &k);
	for(int i = 1; i <= n; i++) 
		for(int j = i; j >= 1; j--) {
			scanf("%d", &pom);
			if(pom < wyn && j *  (i - j + 1) <= k)
				wyn = pom;
		}
	printf("%d\n", wyn);
}