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


int main() {
	int N, a, b, c;
	cin >> N >> a >> b >> c;
	if(b%a==0) b=N+1;
	if(c%a==0 || c%b==0) c=N+1;
	int n[7];
	n[0] = N/a; n[1]=N/b; n[2]=N/c; n[3]=N/(a*b); n[4]=N/(b*c); n[5]=N/(a*c);
	n[6] = N/(a*b*c);
	//printf("n(a)=%d n(b)=%d n(c)=%d\n",n[0],n[1],n[2]);
	//printf("n(ab)=%d n(bc)=%d n(ac)=%d n(abc)=%d\n",n[3],n[4],n[5],n[6]);
	cout << n[0]+n[1]+n[2]-(n[3]+n[4]+n[5])+n[6] << endl;
}