#include<bits/stdc++.h>
using namespace std;

int main(){
	cin.tie(0),ios::sync_with_stdio(false);
	int64_t n,a,b,c; cin>>n>>a>>b>>c;
	int64_t ab=lcm(a,b),bc=lcm(b,c),ca=lcm(c,a),abc=lcm(ab,bc);
	cout<<n/a+n/b+n/c-n/ab-n/bc-n/ca+n/abc<<"\n"s;
}