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#include <bits/stdc++.h>
typedef unsigned long long ull;
typedef long long ll;
typedef unsigned long ul;

using namespace std;
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    long long n, k;
    
    cin >> n >> k;
    
    vector<vector<long long>> wina(n, vector<long long>(n, 0));
    long long res = 2019;
    
    
    for(long long i = 0; i < n; ++i)
    {
        for(ll j = 0; j<=i; ++j)
        {
            ll rocznik;
            cin >> rocznik;
            wina[i][j] = 1;
            if(i-1 >=0)
            {
                if(j-1 >= 0)
                {
                    wina[i][j] += wina[i-1][j-1];
                }
                wina[i][j] += wina[i-1][j];
                if(i-2 >=0 && j-1 >= 0)
                {
                    wina[i][j] -= wina[i-2][j-1];
                }
                
                if(wina[i][j] <= k && rocznik < res)
                    res = rocznik;
            }
            //cout << wina[i][j] << " ";
        }
        //cout << endl;
    }
    cout << res << endl;
}