#include<bits/stdc++.h>
using namespace std;
#define rep(i,a,b) for(int i=a;i<b;i++)



typedef long long ll;
int N, A[101010];
//-----------------------------------------------------------------------------------
int main() {
    cin >> N;
    rep(i, 0, N) scanf("%d", &A[i]);

    ll ans = A[0];
    rep(i, 1, N) {
        ll a;

        a = max(a, ans + A[i]);
        a = max(a, ans - A[i]);
        a = max(a, ans * A[i]);
        if (0 != A[i]) a = max(a, ans / A[i]);

        ans = a;
    }
    printf("%lld\n", ans);
}