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#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#define mp make_pair
#define pb push_back
#define pf push_front
#define eb emplace_back
#define st first
#define nd second
#define vt vector
#define DEBUG if(1)
#define VAR(__var)  #__var << ": " << __var << " "
#define PARA(__var) #__var << ": " << __var.first << ", " << __var.second << " " 
#define FOR(__var, __start, __end)  for(int __var=__start; __var<__end; ++__var)
#define FORB(__var, __start, __end) for(int __var=__start; __var>__end; --__var)
#define all(__var)    (__var).begin(),(__var).end()
#define rall(__var)   (__var).rbegin(),(__var).rend()
#define sz(__var)     (int)(__var).size()
#define satori(__var) int __var; cin>>__var; while(__var--)

using namespace std;

using namespace __gnu_pbds;
template <typename T>
using ord_set = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

const int INF = 1e9+2137;
const ll mod = 1e9+7;

int32_t main()
{
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
 	
	int n;
	cin >> n;
	
	vt<int> a(n);
	FOR(i, 0, n)
		cin >> a[i];
		
	sort(all(a));
	
	gp_hash_table<ll, ll> m;
	m[0] = 1;
	
	vt<pll> ch;
	FOR(i, 0, n)
	{
		for(auto x : m)
		{
			if(x.st >= a[i]-1)
				ch.pb({x.st+a[i], x.nd});
		}
		
		for(auto x : ch)
			m[x.st] = (m[x.st]+x.nd)%mod;
		
		ch.clear();
	}
	
	ll res = 0;
	for(auto x : m)
		res = (res+(x.nd))%mod;
	
	cout << res-1 << '\n';
	
	return 0;
}