#include <iostream>
using namespace std;
int main()
{
float Ma1,Ma2;
int S1=0,S2=0,k1=0,k2=0,i,n,x;
cin>>n;
for(i=1;i<=n;i++)
{
cin>>x;
if(x>0)
{
S1=S1+x;
k1=k1+1;
}
else
{
S2=S2+x;
k2=k2+1;
}
}
if(k1!=0)
{
Ma1=S1/k1;
cout<<Ma1<<endl;
}
if(k2!=0)
{
Ma2=S2/k2;
cout<<Ma2<<endl;
}
return 0;
}