#include <bits/stdc++.h>
#define rep(i, p, n) for (ll i = p; i < (ll)(n); i++)
#define rep2(i, p, n) for(ll i = p; i >= (ll)(n); i-- )
using namespace std;
using ll = long long;
double pi=3.141592653589793;
const long long inf=2*1e9;
const long long linf=8*1e18;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
//atcoder
#include <atcoder/modint>
#include <atcoder/dsu>
using namespace atcoder;
using mint1 = modint1000000007;
using mint2 = modint998244353;

int main() {
    ll N, A, B, C;
    cin >> N >> A >> B >> C;
    ll ans=0;
    ans+=N/A;
    ans+=N/B;
    ans+=N/C;
    ll D=B*C/gcd(B, C);
    ans-=N/D;
    D=B*A/gcd(B, A);
    ans-=N/D;
    D=A*C/gcd(A, C);
    ans-=N/D;
    D=D*B/gcd(B, D);
    ans+=N/D;
    cout << ans;
}