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#include<bits/stdc++.h>
using namespace std;
int mini=1e9+7;
int main()
{
	ios_base::sync_with_stdio(0);
	cin.tie(0);
    int a,b,c;
    cin>>a>>b;
    for(int x=1;x<=a;x++)
        for(int y=1;y<=x;y++)
        {
            cin>>c;
            if(y*(x-y+1)<=b)
                mini=min(mini,c);
        }
    cout<<mini;
	return 0;
}