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

int n, k, a, result;
int main() {
    scanf("%d %d", &n, &k);
    result = 999999;
    for(int i=1; i<=n; ++i) {
        for(int j=1; j<=i; ++j) {
            scanf("%d", &a);
            if (j*(i-j+1) <= k) result = min(result, a);
        }
    }
    printf("%d\n", result);
}