#line 2 "library/src/template.hpp"
#include<bits/stdc++.h>
#define rep(i, N) for (int i = 0; i < (N); i++)
#define all(x) (x).begin(),(x).end()
#define popcount(x) __builtin_popcount(x)
using i128=__int128_t;
using ll = long long;
using ld = long double;
using graph = std::vector<std::vector<int>>;
using P = std::pair<int, int>;
constexpr int inf = 1e9;
constexpr ll infl = 1e18;
constexpr ld eps = 1e-6;
const long double pi = acos(-1);
constexpr uint64_t MOD = 1e9 + 7;
constexpr uint64_t MOD2 = 998244353;
constexpr int dx[] = { 1,0,-1,0 };
constexpr int dy[] = { 0,1,0,-1 };
template<class T>constexpr inline void chmax(T&x,T y){if(x<y)x=y;}
template<class T>constexpr inline void chmin(T&x,T y){if(x>y)x=y;}
#line 2 "main.cpp"
using namespace std;

int main(){
    ll n, a, b, c;
    cin >> n >> a >> b >> c;

    ll sum = 0;
    sum += n / a, sum += n / b, sum += n / c;
    sum -= n / lcm(a, b), sum -= n / lcm(b, c), sum -= n/lcm(c, a);
    sum += n / lcm(a, lcm(b, c));
    cout << sum << '\n';
}