#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
#define int long long int
int ans=0;
int h[1<<21]={0};
int dp[1<<22][22];
main() {
    int n;
    cin>>n;
  	string s;
 	if(n>=3200)cout<<s<<endl;
 	else cout<<"red"<<endl;
  	return 0;
    double a[n+5];
    double ans=0;
    for(int i=1;i<=n;i++){
        cin>>a[i];
    }
    sort(a+1,a+n+1);
    ans=a[1];
    for(int i=2;i<=n;i++){
        ans=(double(ans+a[i]))/2;
    }
    printf("%.10lf",ans);
    // cout<<ans<<endl;
}