#include <fstream>
using namespace std;
int main()
{
ifstream cin("sume2.in");
ofstream cout("sume2.out");
int A[100005], i, j, S[100005], o, aux, a=0;
long long k, n;
cin>>n;
cin>>k;
for(i=1;i<=n;i++)
cin>>A[i];
for(i=1;i<=n;i++)
{
for(j=1;j<=n;j++)
S[j+a]=A[i]+A[j];
a=i*n;
}
do
{
o=1;
for(i=1;i<n*n;i++)
if(S[i]>S[i+1])
{
o=0;
aux=S[i];
S[i]=S[i+1];
S[i+1]=aux;
}
}while(!o);
cout<<S[k]<<"\n";
cin.close();
cout.close();
return 0;
}
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