abc092_b.cc

// #define _GLIBCXX_DEBUG
#include <bits/stdc++.h>

#define FOR(i, a, b) for (int i = (a); i < int(b); ++i)
#define RFOR(i, a, b) for (int i = (b)-1; i >= int(a); --i)
#define REP(i, n) FOR(i, 0, n)
#define REP1(i, n) FOR(i, 1, int(n) + 1)
#define RREP(i, n) RFOR(i, 0, n)
#define RREP1(i, n) RFOR(i, 1, int(n) + 1)
#define ALL(c) begin(c), end(c)

int _ = (
#ifndef LOCAL
    std::cin.tie(nullptr), std::ios::sync_with_stdio(false),
#endif
    std::cout.precision(10), std::cout.setf(std::ios::fixed));

using ll = long long;
using ull = unsigned long long;
using ld = long double;
template <typename T> using vec = std::vector<T>;
using namespace std;

static inline constexpr ll generate_choco_date(ll c, ll Ai) {
  return c * Ai + 1;
}

int main() {
  ll N, D, X;
  cin >> N >> D >> X;
  vec<ll> A(N);
  REP(i, N) cin >> A[i];

  ll answer = X;
  REP(i, N) {
    for (ll j = 0;; j++) {
      const ll choco_date = generate_choco_date(j, A[i]);
      if (choco_date <= D) {
        answer++;
      } else {
        break;
      }
    }
  }

  cout << answer << endl;
  return 0;
}