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#include<bits/stdc++.h>
using namespace std;
#define mp make_pair
#define st first
#define nd second
#define pb push_back
typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;
#define Q 1000000007
#define inf 1000000003
#define maxn 2003

int n, k;
int odp=inf;

int main(){
    scanf("%d%d", &n, &k);
    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) odp=min(odp, a);
        }
    }
    printf("%d\n", odp);
}