#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
//#include<cctype>
#include<climits>
#include<iostream>
#include<string>
#include<vector>
#include<map>
//#include<list>
#include<queue>
#include<deque>
#include<algorithm>
//#include<numeric>
#include<utility>
#include<complex>
//#include<memory>
#include<functional>
#include<cassert>
#include<set>
#include<stack>

const int dx[] = {1, 0, -1, 0};
const int dy[] = {0, 1, 0, -1};
using namespace std;
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vll;
typedef pair<int, int> pii;

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    ll N, a, b, c;
    cin >> N;
    cin >> a >> b >> c;
    ll ab = a/__gcd(a, b)*b;
    ll bc = b/__gcd(b, c)*c;
    ll ca = c/__gcd(c, a)*a;
    ll abc = ab/__gcd(ab, bc)*bc;
    cout << N/a+N/b+N/c-N/ab-N/bc-N/ca+N/abc << endl;
    return 0;
}