#include <bits/stdc++.h>
using namespace std;

using ll=long long;

#define rng(i,a,b) for(int i=int(a);i<int(b);i++)
#define rep(i,b) rng(i,0,b)
#define repn(i, b) rng(i, 1, b+1)
#define pb push_back
#define eb emplace_back
#define all(x) x.begin(),x.end()
#define si(x) int(x.size())
#ifdef LOCAL
#define dmp(x) cerr<<__LINE__<<" "<<#x<<" "<<x<<endl
#else
#define dmp(x) void(0)
#endif

template<class t,class u>bool chmax(t&a,u b){
	if(a<b){
		a=b;return true;
	}else{
		return false;
	}
}
template<class t,class u>bool chmin(t&a,u b){
	if(b<a){
		a=b;return true;
	}else{
		return false;
	}
}

template<class t,class u>
ostream&operator<<(ostream&os,const pair<t,u>&p){
	return os<<"{"<<p.first<<","<<p.second<<"}";
}

template<class t>
ostream&operator<<(ostream&os,const vector<t>&v){
	os<<"{";
	for(auto e:v)os<<e<<",";
	return os<<"}";
}

template<class t> using vc = vector<t>;
#define a first
#define b second
using P=pair<int,int>;
const ll mod = 1000000007;
void add(int &a, int b){
	a += b;
	if(a >= mod) a-=mod;
}

int n, cnt;
vc<P>pos;

int main(){
	cin >> n;
	vc<int>v;
	rep(i, n){
		int a; cin >> a; v.pb(a);
	}
	while(v.back() == 1){
		cnt ++;
		v.pop_back();
	}
	reverse(all(v));
	while(v.back() == 1){
		cnt ++;
		v.pop_back();
	}
	reverse(all(v));
	
	if(v.empty()){
		cout << n << endl;
		return 0;
	}
	ll M = 1, mm = 1;
	rep(i, v.size()){
		if(v[i] > 1) {
			pos.eb(v[i], i);
			M = M * v[i];
			mm = mm * v[i] % mod;
			chmin(M, (ll)(1000007));
		}
	}
	ll ans;
	if(M >= 1000000){
		ans = mm;
	}
	else{
		int dp[22] = {};
		rep(i, pos.size()){
			dp[i+1] = 1;
			for(int j=0;j<=i;j++){
				dp[i+1] *= pos[j].a;
			}
		}
		for(int i=1;i<=pos.size();i++){
			int add = pos[i].a - pos[i-1].a - 1;
			int zan = 1;
			for(int j=i;j<pos.size();j++){
				zan = zan * pos[j].a;
				chmax(dp[j+1], dp[i] + add + zan);
			}
		}
		ans = dp[pos.size()];
	}
	cout << (ans + cnt) % mod << endl;
}