1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#ifdef LOC
#include "debuglib.h"
#else
#define deb(...)
#define DBP(...)
#endif
using namespace std;
using   ll         = long long;
using   Vi         = vector<int>;
using   Pii        = pair<int, int>;
#define pb           push_back
#define mp           make_pair
#define x            first
#define y            second
#define rep(i, b, e) for (int i = (b); i < (e); i++)
#define each(a, x)   for (auto& a : (x))
#define all(x)       (x).begin(), (x).end()
#define sz(x)        int((x).size())

constexpr int MOD = 1e9+7;

int main() {
	cin.sync_with_stdio(0); cin.tie(0);
	cout << fixed << setprecision(10);

	int n; cin >> n;
	Vi a(n);
	each(k, a) cin >> k;
	sort(all(a));

	vector<ll> dp(5005);
	dp[0] = 1;

	each(k, a) {
		for (int s = sz(dp)-1; s >= k-1; s--) {
			auto& out = dp[min(s+k, sz(dp)-1)];
			out += dp[s];
			if (out >= MOD) out -= MOD;
		}
	}

	ll ans = accumulate(all(dp), 0ll) - 1;
	ans %= MOD;
	if (ans < 0) ans += MOD;
	cout << ans << '\n';
	return 0;
}