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#include <iostream>

using namespace std;
int n,m,a,wart,odp=25000;
int wy;
char ch;
bool bb;
int fastread ()
{
    wy=0;
    bb=false;
    ch=getchar();
    if (ch=='-')
    {
        bb=true;
        ch=getchar();
    }
    while (ch>='0'&&ch<='9')
    {
        wy*=10;
        wy+=int(ch)-48;
        ch=getchar();
    }
    if (bb)
        return -wy;
    return wy;
}

int main()
{
    n=fastread();
    m=fastread();
    for(int i=1;i<=n;i++)
    {
        for(int j=1;j<=i;j++)
        {
            a=fastread();
            wart=(i-j+1)*j;
            if(wart<=m&&a<odp)
            {
                odp=a;
            }
        }
    }
    cout<<odp;
    return 0;
}