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#include <bits/stdc++.h>

using namespace std;

#define st first
#define nd second
#define pb push_back
#define sz(x) (int)(x).size()
#define ll long long
ll mod=1000000007;
int inf=1000000007;
ll infl=1000000000000000007;

ll DP[5007];
ll a[5007];
ll pot[5007];

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    pot[0]=1;
    for(int i=1;i<=5000;i++) pot[i]=pot[i-1]*2%mod;
    int n;
    cin>>n;
    for(int i=1;i<=n;i++) cin>>a[i];
    sort(a+1,a+1+n);
    DP[0]=1;
    ll ans=0;
    for(int i=1;i<=n;i++)
    {
        for(int j=4998;j>=a[i]-1;j--)
        {
            if(j+a[i]>4998) ans=(ans+DP[j]*pot[n-i])%mod;
            else DP[j+a[i]]=(DP[j+a[i]]+DP[j])%mod;
        }
    }
    for(int i=1;i<=4998;i++) ans=(ans+DP[i])%mod;
    cout<<ans;

    return 0;
}