import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	int n = sc.nextInt();
    	long max = 0;
    	long min = 0;
    	for (int i = 0; i < n; i++) {
    	    long x = sc.nextInt();
    	    long nextMax = max + x;
    	    nextMax = Math.max(nextMax, max - x);
    	    nextMax = Math.max(nextMax, max * x);
    	    nextMax = Math.max(nextMax, min + x);
    	    nextMax = Math.max(nextMax, min - x);
    	    nextMax = Math.max(nextMax, min * x);
    	    long nextMin = max + x;
    	    nextMin = Math.min(nextMin, max - x);
    	    nextMin = Math.min(nextMin, max * x);
    	    nextMin = Math.min(nextMin, min + x);
    	    nextMin = Math.min(nextMin, min - x);
    	    nextMin = Math.min(nextMin, min * x);
    	    max = nextMax;
    	    min = nextMin;
    	}
    	System.out.println(max);
	}
}