import java.util.*;

public class Main {
    public static Scanner sc = new Scanner(System.in);
    public static void main(String[] args) throws Exception {
        int n = sc.nextInt();
        int[] a = new int[n];
        for (int i = 0;i < n;i++) a[i] = sc.nextInt();
        long[] dp = new long[100];
        dp[0] = a[0];
        for (int i = 1;i < n;i++) {
            long tmp = Long.MIN_VALUE;
            tmp = Math.max(tmp, dp[i-1]+a[i]);
            tmp = Math.max(tmp, dp[i-1]-a[i]);
            tmp = Math.max(tmp, dp[i-1]*a[i]);
            if (a[i]!=0) tmp = Math.max(tmp, dp[i-1]/a[i]);
            dp[i] = tmp;
        }
        System.out.println(dp[n-1]);
    }
}