#include <bits/stdc++.h>

using std::cin;
using std::cout;
using std::lcm;
using ll = long long;

int main() {
    ll n, a, b, c;
    cin >> n >> a >> b >> c;
    
    ll ans = n/a + n/b + n/c;
    ans -= n/lcm(a,b) + n/lcm(a,c) + n/lcm(b,c);
    ans += n/lcm(lcm(a,b),c);
    
    cout << ans << '\n';
    
    return 0;
}