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#include <iostream>

using namespace std;

int main()
{
    // std::ifstream in("./input.txt");
    // std::cin.rdbuf(in.rdbuf());
    int n,k,tmp,additive,val,min=2147483647;
    cin>>n;
    cin>>k;
    for (int i=1;i<n+1;i++){
       tmp=i;
       additive=i-2;
       for(int j=0;j<i;j++){
            cin >> val;
            tmp+=additive;
            additive-=2;
            if (tmp<=k && val<min) min=val;
       }
    }
    cout<<min<<endl;
    return 0;
}