#include <bits/stdc++.h>

#define rep(i,n) for(int i=0;i<(n);i++)

using namespace std;
using lint=long long;

int main(){
	int n,a[16]; scanf("%d",&n);
	rep(i,n) scanf("%d",&a[i]);

	vector<vector<lint>> L(n);
	L[0]={a[0]};
	rep(i,n-1){
		for(lint x:L[i]){
			L[i+1].emplace_back(x+a[i+1]);
			L[i+1].emplace_back(x-a[i+1]);
			L[i+1].emplace_back(x*a[i+1]);
			if(a[i+1]!=0) L[i+1].emplace_back(x/a[i+1]);
		}
		sort(L[i+1].begin(),L[i+1].end());
		L[i+1].erase(unique(L[i+1].begin(),L[i+1].end()),L[i+1].end());
	}
	printf("%lld\n",L[n-1].back());

	return 0;
}