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#include <iostream>

using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    int n,k,a;
    int lowest=3000;
    cin>>n>>k;
    for(int i=1;i<=n;++i){
        for(int j=1;j<=i;++j){
            cin>>a;
            if((i-j+1)*j<=k && a<lowest)lowest=a;
    }}
    cout<<lowest;
    return 0;
}
/*
5 5
1999
2019 2010
850 1500 1600
900 900 710 900
1000 800 600 800 1000
*/