import java.util.*;
import java.io.*;

public class Main {
    
    public static Scanner sc = new Scanner(System.in);
    public static PrintWriter pw = new PrintWriter(System.out);
    
    public static void main(String[] args) {
        
        int T = 1;
        while( T > 0 ) {
            solve();
            T--;
        }
        
        pw.flush();
        
    }
    
    static void solve() {
        
        int N = sc.nextInt();
        long[] a = new long[N];
        for( int i = 0; i < N; i++ ) {
            a[i] = sc.nextInt();
        }
        
        Arrays.sort(a);
        if( N == 1 ) {
            pw.println(a[0]);
        }else if( N == 2 ) {
            pw.println(a[0]*a[1]);
        }else if( N > 2 && N%2 == 0 ) {
            pw.println(Math.min(a[0]*a[1],a[2]));
        }else {
            pw.println(1);
        }
        
    }
    
}