#include "bits/stdc++.h"
using namespace std;
#define fastcin {\
    cin.tie(0);\
    ios::sync_with_stdio(false);\
}
#define rep(i, a, b) for(int i = a; i < b; i++)
#define print(x) cout << x << "\n"
typedef long long ll;

int main() {
    fastcin;
    ll n, a[7], ans = 0;
    cin >> n >> a[0] >> a[1] >> a[2];
    a[3] = lcm(a[0], a[1]);
    a[4] = lcm(a[1], a[2]);
    a[5] = lcm(a[0], a[2]);
    a[6] = lcm(a[3], a[4]);
    rep(i, 0, 3) ans += n/a[i];
    rep(i, 3, 6) ans -= n/a[i];
    ans += n/a[6];
    print(ans);
    return 0;
}