#include <iostream>using namespace std;
double media(int n,int v[]){ int s=0,c=0; for(int i=0;i<n;++i) if(v[i]%2) s+=v[i],c++; if(s==0) return 0; double M=(double)s/c; M*=100; // Pentru a obtine rezultat cu doua zecimale M=(int)(M); return M/100;}int main(){ int n,v[100]; cin>>n; for(int i=0;i<n;++i) cin>>v[i]; cout<<media(n,v); return 0;}