#include<iostream>
using ll = long long; 
ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
using namespace std;
int main(){
    long long int a,b,c,n,ans,r1,r2;
    cin >> n >> a >> b >> c;
    r1 = n/lcm(a,b)+n/lcm(b,c)+n/lcm(c,a);
    r2 = n/lcm(a,lcm(b,c));
    ans = n/a + n/b + n/c;
    cout << ans-r1+r2 << endl;
    return 0;
}