#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,sum=0;
	double t;
	cin>>n;
	for(int i=1;i<=n;i=i+1)
	{
	cin>>a;	
	sum=sum+a;
	}	
	t=sum*1.0/n;
	printf("%.2lf",t);
	return 0;
}

#include<bits/stdc++.h>
#include<iomanip>
using namespace std;
int main(){
 int n,x,sum=0;
 cin>>n;
 for(int i=0;i<n;i=i+1){
    cin>>x;
    sum+=x;
}
 cout<<fixed<<setprecision(2)<<1.0*sum/n;
return 0;
}

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