#pragma GCC optimize(3)
#pragma GCC target("avx")
#pragma GCC target("avx,avx2")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("inline")
#pragma GCC optimize("-fgcse")
#pragma GCC optimize("-fgcse-lm")
#pragma GCC optimize("-fipa-sra")
#pragma GCC optimize("-ftree-pre")
#pragma GCC optimize("-ftree-vrp")
#pragma GCC optimize("-fpeephole2")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-fsched-spec")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-falign-jumps")
#pragma GCC optimize("-falign-loops")
#pragma GCC optimize("-falign-labels")
#pragma GCC optimize("-fdevirtualize")
#pragma GCC optimize("-fcaller-saves")
#pragma GCC optimize("-fcrossjumping")
#pragma GCC optimize("-fthread-jumps")
#pragma GCC optimize("-funroll-loops")
#pragma GCC optimize("-fwhole-program")
#pragma GCC optimize("Ofast,fast-math")
#pragma GCC optimize("-freorder-blocks")
#pragma GCC optimize("-fschedule-insns")
#pragma GCC optimize("inline-functions")
#pragma GCC optimize("-ftree-tail-merge")
#pragma GCC optimize("-fschedule-insns2")
#pragma GCC optimize("-fstrict-aliasing")
#pragma GCC optimize("-fstrict-overflow")
#pragma GCC optimize("-falign-functions")
#pragma GCC optimize("-fcse-skip-blocks")
#pragma GCC optimize("-fcse-follow-jumps")
#pragma GCC optimize("-fsched-interblock")
#pragma GCC optimize("-fpartial-inlining")
#pragma GCC optimize("no-stack-protector")
#pragma GCC optimize("-freorder-functions")
#pragma GCC optimize("-findirect-inlining")
#pragma GCC optimize("-fhoist-adjacent-loads")
#pragma GCC optimize("-frerun-cse-after-loop")
#pragma GCC optimize("inline-small-functions")
#pragma GCC optimize("-finline-small-functions")
#pragma GCC optimize("-ftree-switch-conversion")
#pragma GCC optimize("-foptimize-sibling-calls")
#pragma GCC optimize("-fexpensive-optimizations")
#pragma GCC optimize("-funsafe-loop-optimizations")
#pragma GCC optimize("inline-functions-called-once")
#pragma GCC optimize("-fdelete-null-pointer-checks")
#pragma GCC optimize(2)
#include<bits/stdc++.h>
//#include<iostream>
//#include<string>
//#include<cmath>
//#include<cstdio>
//#include<cctype>
//#include<cstring>
//#include<iomanip>
//#include<cstdlib>
//#include<ctime>
//#include<set>
//#include<map>
//#include<utility>
//#include<queue>
//#include<vector>
//#include<stack>
//#include<sstream>
//#include<algorithm>
using namespace std;
/*=====================================================================*/
#define ll long long
#define int ll
#define pii pair<int,int>
#define vi vector<int>
#define vii vector<pii>
#define pdd pair<double,double>
#define ull unsigned long long
#define pb push_back
#define rep(i,n) for(int i=0;i<(int)(n);++i)
#define all(s) (s).begin(),(s).end()
#define repd(i,n) for(int i=(int)(n)-1;i>=0;--i)
#define forr(i,a,b,c) for(int i=(int)(a);i<=(int)(b);i+=(int)(c))
#define forn(i,p,n) for(int i=(int)(p);i<=(int)(n);++i)
#define ford(i,p,n) for(int i=(int)(n);i>=(int)(p);--i)
#define foreach(i,c) for(__typeof(c.begin())i=(c.begin());i!=(c).end();++i)
#define INF 0x3f3f3f3f
#define PI acos(-1)
#define Endl(x) cout<<x<<endl;
#define Blank(x) cout<<x<<" ";
#define modcg(x) if(x>=mod)x-=mod;
#define modcl(x) if(x<0)x+=mod;
#define lowbit(x) x&(-x)
/*=====================================================================*/
string int_to_string(ll n)
{
	string s="";
	while(n)
	{
		ll now=n%10;
		s+=now+'0';
		n/=10;
	}
	reverse(s.begin(),s.end());
	return s;
}
ll string_to_int(string s)
{
	ll n=0;
	rep(i,s.size())
	{
		n*=10;
		n+=s[i]-'0';
	}
	return n;
}
mt19937 gen(chrono::system_clock::now().time_since_epoch().count());
int Rand(int l,int r)
{
	uniform_int_distribution<>RAND1(l,r);
	return RAND1(gen);
}
/*======================================================================*/
const int dx[]={-1,0,1,0};
const int dy[]={0,-1,0,1};
const int month[2][12]={{31,28,31,30,31,30,31,31,30,31,30,31},{31,29,31,30,31,30,31,31,30,31,30,31}};
//think twice,code once
//think once,debug forever
const int MAXN=1e5+10,p=999999956,mod=1e9+7;
int a[MAXN];
int n;
int dp[MAXN][2];
int quickpower(int a,int b)
{
	int res=1;
	while(b)
	{
		if(b&1)
		{
			res*=a;
			res%=mod;
		}
		a*=a;
		a%=mod;
		b>>=1;
	}
	return res;
}
int inv(int x)
{
	return quickpower(x,mod-2);
}
int f[MAXN][2];
void solve()
{
	int all=1;
	forn(i,1,n)
	{
		cin>>a[i];
		all*=a[i];
	}
	f[0][0]=1;
	forn(i,1,n)
	{
		f[i][0]=f[i-1][1]*a[i]%mod+f[i-1][0]*p%mod;
		f[i][1]=f[i-1][0]*a[i]%mod+f[i-1][1]*p%mod;
//		cout<<f[i][0]<<" "<<f[i][1]<<endl; 
	}
	int ans=f[n][0]-f[n][1];
	ans%=mod;
	modcl(ans);
//	cout<<ans<<endl;
	ans-=all;
	modcl(ans);
	ans*=inv(p);
	ans%=mod;
	cout<<ans<<endl;
}
/*======================================================================*/
signed main()
{
    cin.tie(0);
    cout.tie(0);
	std::ios::sync_with_stdio(false);
//#define Hank2007
#ifdef Hank2007
	freopen("input.txt","r",stdin);
	freopen("output.txt","w",stdout);
#endif
  	/*====================================================================*/
//  	int TEST_CASE=1;
//	cin>>TEST_CASE;
  	while(cin>>n)
  	{
  		solve();
  	}
  	return 0;
}