#include <iostream>
#include <numeric>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long ll;

int main() {
    ll N; cin>>N;
    ll a, b, c; cin>>a>>b>>c;
    
    
    ll a_v, b_v, c_v;
    ll ab_v, bc_v, ca_v;
    
    a_v = N/a; b_v = N/b, c_v = N/c;

    ab_v = N/(a*b); bc_v = N/(b*c); ca_v = N/(c*a);
    ll abc_v = N/(a*b*c);

    if(b%a==0) {b_v = 0; ab_v = 0; bc_v = 0; abc_v = 0;}
    if(c%a==0) {c_v = 0; ca_v = 0; bc_v = 0; abc_v = 0;}
    if(c%b==0) {c_v = 0; bc_v = 0; ca_v = 0; abc_v = 0;}
    
    ll ans = a_v + b_v + c_v - ab_v - bc_v - ca_v + abc_v;
    cout<<ans<<endl;
}