#include <bits/stdc++.h>
#define p(s) cout<<(s)<<endl
typedef long long ll;
using namespace std;

int main(){
	int N;
	cin>>N;
	int a,b,c;
	int ans=0;
	cin>>a>>b>>c;
	ans+=N/a+N/b+N/c;
	int lcm_ba=b/__gcd(a,b)*a;
	int lcm_ca=c/__gcd(a,c)*a;
	int lcm_cb=c/__gcd(b,c)*b;
	ll lcm_abc=c/__gcd(lcm_ba,a)*lcm_ba;
	ans-=N/lcm_ba+N/lcm_ca+N/lcm_cb;
	ans += N/lcm_abc;
	p(ans);
	return 0;
}