#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
// #include <atcoder/modint>
// #include <atcoder/fenwicktree>
// #include <atcoder/segtree>
// #include <atcoder/scc>
// #include <atcoder/dsu>

#define all(x) begin(x), end(x)

using namespace std;
// using namespace atcoder;
// using mint = atcoder::modint998244353;
// using mint = atcoder::modint1000000007;
using i32 = int;
using i64 = long long;
using ld = long double;

template <typename T1, typename T2>
inline bool chmax(T1 &a, T2 b) {return a < b and (a = b, true);}

template <typename T1, typename T2>
inline bool chmin(T1 &a, T2 b) {return a > b and (a = b, true);}

const i64 supl = LONG_LONG_MAX / 2 - 100;
const i32 supi = INT_MAX / 2 - 100;

i64 cnt(i32 n, i64 d) {
    return n / d;
}

void main_() {
    i32 n; cin >> n;
    i64 a, b, c; cin >> a >> b >> c;
    i64 ans = 0;
    ans += cnt(n, a) + cnt(n, b) + cnt(n, c);
    ans -= cnt(n, lcm(a, b)) + cnt(n, lcm(b, c)) + cnt(n, lcm(c, a));
    ans += cnt(n, lcm(a, lcm(b, c)));
    cout << ans << endl;
}

int main() {
    ios::sync_with_stdio(false);
    std::cin.tie(nullptr);

    main_();

    return 0;
}