#include<bits/stdc++.h>
using namespace std;
#define int long long
#define REP(i,m,n) for(int i=(m);i<(n);i++)
#define rep(i,n) REP(i,0,n)
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(c) (c).rbegin(),(c).rend()
#define mp make_pair
#define endl '\n'
#define fi first
#define se second
#define vec vector<ll>
#define mat vector<vector<ll> >
typedef long long ll;
typedef pair<ll,ll> pll;
typedef long double ld;
const ll inf=1e9+7;
const ll mod=998244353;
signed main(){
    ll n;cin>>n;
    vector<ll>a(n);
    rep(i,n)cin>>a[i];
    rep(i,n-1){
        vector<ll>b(0);
        rep(j,a.size()-1){
            b.pb((a[j]+a[j+1])%inf);
        }
        a=b;
    }
    cout<<a[0]<<endl;
}