#include <iostream>
using namespace std;
typedef long long LL;
LL gcd(LL a, LL b)
{
    return b == 0 ? a : gcd(b, a % b);
}
LL lcm(LL a,LL b)
{
	LL g=gcd(a,b);
	if (g>0){
		return a*b/g;
	}
	return 0;
}
int main(int argc, char* argv[])
{
	LL x=lcm(4,6);
	LL N,a,b,c;
	cin>>N;
	cin>>a>>b>>c;
	if (c%b==0 || c%a==0){
		c=0;
	}
	if (b%a==0){
		b=0;
	}

	LL a1=0,b1=0,c1=0,d1=0,e1=0,f1=0,g1=0;
	a1=N/a;
	if (b>0){
		b1=N/b;
	}
	if (c>0){
		c1=N/c;
	}
	if (b>0){
		d1=N/lcm(a,b);
	}
	if (c>0){
		f1=N/lcm(a,c);

	}
	if (b>0 &&c>0){
		e1=N/lcm(b,c);
		g1=N/lcm(a,lcm(b,c));
	}
	cout<<a1+b1+c1-d1-e1-f1+g1<<endl;
	return 0;
}