#include <stdio.h>

void calc(int a, int *ans)
{
	if (a < 0) *ans -= a;
	else if (*ans + a > *ans * a) *ans += a;
	else *ans *= a;
}

int main(void)
{
	int N, a, ans = 0, i;
	scanf("%d", &N);
	for (i = 0; i < N; ++i) {
		scanf("%d", &a);
		calc(a, &ans);
	}
	printf("%d", ans);
	return 0;
}