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#include <cstdio>
int n, k;

int main(){
    scanf("%d%d", &n, &k);
    int best = 2019;
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= i; j++){
            int a;
            scanf("%d", &a);
            int l = j, r = i - j + 1;
            if ((l * r <= k) && (a < best)){
                best = a;
            }
        }
    }
    printf("%d\n", best);
}