#include <bits/stdc++.h>

using namespace std;

constexpr auto exps = array{61, 59, 53, 47};
using E = decay_t<decltype(exps)>;
constexpr int N = 3e5 + 1;
constexpr uint64_t mod = -49ull / 2;

template <int i>
struct um: conditional_t<i == exps.size(), vector<int>, unordered_map<uint64_t, um<i + 1>>> { };

um<0> m;

vector<int> ls[N];

template <int i = 0>
auto& mget(const E& e, auto& m) {
  if constexpr (i == exps.size()) return m;
  else return mget<i + 1>(e, m[e[i]]);
}

template <int i = 0>
void walk(const E& e, auto& m, uint64_t k, uint64_t pr, auto f) {
  if constexpr (i == exps.size()) f(m, k);
  else {
    uint64_t step = pr;
    while (step % exps[i] != 1) step += pr;
    while (k % exps[i]) k += pr;
    pr *= exps[i];
    for (int j = 0; j < exps[i]; ++j) {
      auto it = m.find((e[i] + (1ull << exps[i]) - 1 - (1ull << j)) % ((1ull << exps[i]) - 1));
      if (it != m.end()) walk<i + 1>(e, it->second, k, pr, f);
      k = (k + step) % pr;
    }
  }
}

int dp[N];

uint64_t pw[(int)1e6 + 23];
uint64_t pss[N];

int main() {
  cin.tie(0)->sync_with_stdio(0);
  pw[0] = 1;
  for (uint64_t i = 1, p = 2; i < size(pw); ++i) pw[i] = p, p = (p + p) % mod;
  int n; cin >> n;
  E ps{};
  uint64_t psm{};
  for (int i = 0; ; ++i) {
    mget(ps, m).push_back(i);
    walk(ps, m, 0, 1, [&](auto& v, auto k) { if (k < size(pw)) for (auto& j: v) if (pss[j] == (psm + mod - pw[k]) % mod) ls[i].push_back(j); });
    pss[i] = psm;
    if (i == n) break;
    int v; cin >> v;
    for (int j = 0; j < exps.size(); ++j) ps[j] = (ps[j] + (1ull << v % exps[j])) % ((1ull << exps[j]) - 1);
    psm = (psm + pw[v]) % mod;
  }
  dp[0] = 1;
  for (int i = 1; i <= n; ++i)
  for (auto j: ls[i]) dp[i] = (dp[i] + dp[j]) % ((int)1e9 + 7);
  cout << dp[n];
}