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#include <bits/stdc++.h>
 
#define st first
#define nd second
#define pb push_back
#define BOOST ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0);
#define PI 3.14159265359
 
using namespace std;
 
typedef long long ll;
constexpr ll MOD = 1000000007, hot = 29;
constexpr ll FOX = 1234567891, cute = 1009;
constexpr ll MEGAN = 1000000009, liv = 107;
constexpr int MXN = 5000+7 + 10, CZAPA = (1<<20), INF = 1000000000;

int n, tab[MXN];
ll dp[MXN];

int main(){	
	BOOST;

	cin>> n;
	for(int i=0; i<n; i++){
		cin>> tab[i];
	}
	sort(tab, tab+n);
	dp[0] = 1;
	ll ans = 0;
	for(int i=0; i<n; i++){
		int x = tab[i];
		int idx = 5000;
		dp[5001] *= 2;
		dp[5001] %= MOD;
		while(idx >= x-1){
			if(dp[idx] > 0){
				int y = min(idx+x, 5001);
				dp[y] += dp[idx];
				dp[y] %= MOD;
			}
			idx--;
		}
	}
	for(int i=1; i<=5001; i++){
		ans += dp[i];
		ans %= MOD;
	}
	cout<< ans%MOD << '\n';

	

	return 0;
}