#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for(int i=0; i<(n); i++)
typedef long long ll;

int main(){
	ll n,a,b,c; cin>>n>>a>>b>>c;
	ll x,y,z;
	x=n/a; y=n/b; z=n/c;
	ll ab=n/lcm(a,b);
	ll ac=n/lcm(a,c);
	ll bc=n/lcm(b,c);
	ll abc=n/lcm(lcm(a,b),c);
	cout<<x+y+z-ab-ac-bc+abc<<endl;
}