#include <bits/stdc++.h>
typedef  long long ll;
#define INF 1000000000
using namespace std;
#define N 1000000
#define MOD 1000000007
ll gcd(ll a,ll b){
    if(a<b){
        return gcd(b,a);
    }
    while(b!=0){
        int r=a%b;
        a=b;
        b=r;
    }
    return a;
}
ll lcm(ll a,ll b){
    return a*b/gcd(a,b);
}
int main(void){
    ll n,a,b,c;
    cin>>n>>a>>b>>c;
    ll ans=(n/a)+n/b+n/c-(n/lcm(a,b)+n/lcm(b,c)+n/lcm(c,a))+n/lcm(a,lcm(b,c));
    cout<<ans<<endl;
}