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#include <algorithm>
#include <cstdio>
using namespace std;

#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define INT(x) int x; scanf("%d", &x)

int main() {
	INT(n);
	INT(k);
	int r = 3000;
	REP(i,n) {
		REP(j,i+1) {
			INT(a);
			if ((j + 1) * (i - j + 1) <= k) r = min(r, a);
		}
	}
	printf("%d\n", r);
}