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

int main(){
	int N,a,b,c;
	ll ans=0;
	cin>>N>>a>>b>>c;
	ans+=N/a+N/b+N/c;
	ans-=N/lcm(b,a)+N/lcm(c,a)+N/lcm(c,b);
	ans+=N/lcm(a,lcm(c,b));
	p(ans);
	return 0;
}