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#include <bits/stdc++.h>

using namespace std;

int main()
{
int n, k;
int  mn = 2020;
scanf("%d%d", &n, &k);
int ile = 1;
int x;

//int p;
for(int i = 1; i <= n; ++i){
    for(int j= 1; j < i+1; ++j){

        ile = 1;
        scanf("%d", &x);
       // cout<<i<<" "<<j<<endl;
        if(i > k)
            continue;
        else{
            if(j % 2 == 0)
                ile =  (i + i - ( (j-1) * 2) ) * (j/2);
            else
                ile = ( (i + i - ( (j-1) * 2) ) /2) * j;
        }
        //cout<<"ile ="<<ile<<endl;
        if(ile <= k){
            if(mn > x)
                mn = x;
        }
    }
}

printf("%d", mn);
    return 0;
}