#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

#define RREP(i,s,e) for (i = e-1; i >= s; i--)
#define rrep(i,n) RREP(i,0,n)
#define REP(i,s,e) for (i = s; i < e; i++)
#define rep(i,n) REP(i,0,n)
#define INF 1e8

typedef long long ll;

int gcd(int a, int b) {
    return (b == 0) ? a : gcd(b,a%b);
}

ll lcd(ll a, ll b) {
    return a * b / gcd(a,b);
}

int main() {
    int n, a, b, c, ans;
    cin >> n >> a >> b >> c;
    ans = 0;
    ans += n / a + n / b + n / c;
    ans -= n / lcd(a,b) + n / lcd(b,c) + n / lcd(c,a);
    ans += n / lcd(lcd(a,b),c);
    cout << ans << endl;
    return 0;
}