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#include<iostream>
using namespace std;

int tab[2000000];

int main(){
     ios::sync_with_stdio(0);
cin.tie(0);
int n,k,najm = 0 ,m = 0,ile = 0;
cin>>n>>k;
for(int i =0;i<(n*(n+1))/2;i++){
    cin>>tab[i];
}
najm = tab[0];
for(int i = 0;i<=k/2;i++){
  m +=i;
  for(int j = m;j<m+i;j++){
    if(tab[j]<najm)
        najm = tab[j];
  }

}

cout<<najm;
}