#include<bits/stdc++.h>
#define int long long
using namespace std;
int n,a,b,c;
int gcd(int x,int y){
	return y?gcd(y,x%y):x;
}
int lcm(int x,int y){
	return x*y/gcd(x,y);
}
signed main(){
	cin>>n>>a>>b>>c;
	int t=n;
	t-=(n/a+n/b+n/c);
	t+=n/lcm(a,b);
	t+=n/lcm(b,c);
	t+=n/lcm(a,c);
	t-=n/lcm(lcm(a,b),c);
	cout<<t;
	return 0;
}