Proced_3_Pratyb_3.05

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
double n,a[11],sum=0,z=0;
cin>>n;
for(int i=0;i<n;i++)
{cin>>a[i];if(a[i]>0){sum+=a[i];z+=1;}}
if(z==0){cout<<"NO"<<endl;}else{cout<<fixed<<setprecision(2)<<sum/z<<endl;}
return 0;
}