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#include <bits/stdc++.h>

#define pb push_back
#define pf push_front
#define turbo cin.tie(0); cout.tie(0); ios_base::sync_with_stdio(false);
#define fi first
#define sc second
#define ll long long
#define mp make_pair
#define un unsigned

#define debug 0

using namespace std;

const int ile=2007;

int pir[ile][ile];

inline int cost(int i,int j){
    return (j+1)*(i-j+1);
}

int main()
{
    turbo
    int n,k;
    cin>>n>>k;
    for(int i=0;i<n;i++)
        for(int j=0;j<=i;j++)
            cin>>pir[i][j];
    int mini=pir[0][0];
    for(int i=0;i<n;i++){
        if(cost(i,0)>k)
            break;
        for(int j=0;j<=i;j++)
            if(cost(i,j)<=k)
                mini=min(mini,pir[i][j]);
    }
    cout<<mini;
    return 0;
}