#include <bits/stdc++.h>
using namespace std;
long long a[1000],i,n,t;
int main()
{
cin>>n;
for (i=1; i<=n; i++) cin>>a[i];
for (i=1; i<=n; i++) cout<<a[i]<<" ";
cout<<endl;
t=0;
for (i=1; i<=n; i++)
if (i%3==0) t+=i;
cout<<t<<endl;
for (i=1; i<=n; i++)
if (a[i]<0) cout<<a[i]<<" ";
return 0;
}