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#include<bits/stdc++.h>
using namespace std;
int n,k,a,dp[2005][2005],minik=2020;
int main()
{
ios_base::sync_with_stdio(0);
cin>>n>>k;
for(int i=1;i<=n;i++)
    {
    for(int j=1;j<=i;j++)
        {
        cin>>a;
        if(i>1)dp[i][j]=dp[i-1][j]+dp[i-1][j-1]-dp[i-2][j-1]+1;
        else dp[i][j]=1;
        //cout<<dp[i][j];
        if (dp[i][j]<=k)minik=min(minik,a);
        }
    }
cout<<minik;
}