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#include <iostream>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    int t,n,k,x1,x2,v,minn=1000000;cin>>n>>k;
    for(int i=1;i<=n;i++){
        x1=i-1;
        x2=-1;
        cin>>t;
        v=x1;
        if(v<k){minn=min(t,minn);}
        for(int j=1;j<i;j++){
            cin>>t;
            x1--;
            x2++;
            v=v+x1-x2;
            if(v<k){minn=min(t,minn);}
        }
    }
    cout<<minn<<'\n';
    return 0;
}