#include<bits/stdc++.h>
using std::cin;
using std::cout;
using std::endl;
using std::vector;
using ll=long long;
const int mod=1e9+7;
int main(){
    int N; cin>>N;
    vector<int> A(N);
    for(int i=0;i<N;i++) cin>>A[i];
    {
        vector<int> B=A;
        sort(B.begin(),B.end());
        if(B[N-1]==1){
            cout<<N<<endl;
            return 0;
        }
    }
    ll ans=1;
    for(int i=0;i<N;i++){
        ans*=A[i];
        if(ans>=2*N) break;
    }
    if(ans>=2*N){
        ans=1;
        for(int i=0;i<N;i++){
            ans*=A[i];
            ans%=mod;
        }
        for(int i=0;i<N;i++){
            if(A[i]>1) break;
            ans++;
        }
        for(int i=N-1;i>=0;i--){
            if(A[i]>1) break;
            ans++;
        }
        ans%=mod;
        cout<<ans<<endl;
        return 0;
    }
    ans=0;
    for(int i=N-1;i>=0;i--){
        if(A[i]>1) break;
        ans++;
        A.pop_back();
    }
    reverse(A.begin(),A.end());
    for(int i=A.size()-1;i>=0;i--){
        if(A[i]>1) break;
        ans++;
        A.pop_back();
    }
    vector<int> comp(1,A[0]);
    for(int i=1;i<A.size();i++){
        if(A[i]>1){
            if(A[i-1]>1) comp[comp.size()-1]*=A[i];
            else comp.push_back(A[i]);
        }
        else{
            if(A[i-1]>1) comp.push_back(1);
            else comp[comp.size()-1]++;
        }
    }
    int M=comp.size();
    ll max=0;
    for(int i=0;i<(1<<M/2);i++){
        ll sum=0,now=comp[0];
        for(int j=1;j<M;j+=2){
            if(i&(1<<(j/2))){
                now*=comp[j+1];
            }
            else{
                sum+=now+comp[j];
                now=comp[j+1];
            }
        }
        sum+=now;
        max=std::max(max,sum);
    }
    ans+=max;
    cout<<ans<<endl;
}