import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int v[] = new int[n];
        for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        }

        Arrays.sort(v);
        double ans = v[0];
        for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        }
        System.out.println(ans);
    }
} import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int v[] = new int[n];
        for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        }

        Arrays.sort(v);
        double ans = v[0];
        for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        }
        System.out.println(ans);
    }
} Main public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int v[] = new int[n];
        for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        }

        Arrays.sort(v);
        double ans = v[0];
        for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        }
        System.out.println(ans);
    } main {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int v[] = new int[n];
        for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        }

        Arrays.sort(v);
        double ans = v[0];
        for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        }
        System.out.println(ans);
    } Scanner in = new Scanner(System.in); in new Scanner(System.in) int n = in.nextInt(); n in.nextInt() in.nextInt in int v[] = new int[n]; v new int[n] n for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            v[i] = in.nextInt();
        } {
            v[i] = in.nextInt();
        } v[i] = in.nextInt() v[i] v i in.nextInt() in.nextInt in Arrays.sort(v) Arrays.sort Arrays v double ans = v[0]; ans v[0] v 0 for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        } int i = 1; int i = 1; i 1 i < n i n i++ i++ i {
            ans = (ans + v[i]) / 2;
        } {
            ans = (ans + v[i]) / 2;
        } ans = (ans + v[i]) / 2 ans (ans + v[i]) / 2 (ans + v[i]) ans v[i] v i 2 System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int v[] = new int[n];
        for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        }

        Arrays.sort(v);
        double ans = v[0];
        for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        }
        System.out.println(ans);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int v[] = new int[n];
        for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        }

        Arrays.sort(v);
        double ans = v[0];
        for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        }
        System.out.println(ans);
    }
} Main
import java.util.Arrays;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int n = in.nextInt();
        int v[] = new int[n];
        for (int i = 0; i < n; i++) {
            v[i] = in.nextInt();
        }

        Arrays.sort(v);
        double ans = v[0];
        for (int i = 1; i < n; i++) {
            ans = (ans + v[i]) / 2;
        }
        System.out.println(ans);
    }
}