#define _USE_MATH_DEFINES
#include<stdio.h>
#include<string>
#include<iostream>
#include<cctype>
#include<cstdio>
#include<vector>
#include<stack>
#include<queue>
#include <algorithm>
#include<math.h>
#include<set>
#include<map>
#include<iomanip>

//#include<bits/stdc++.h>



using namespace std;

long gcd(long a,long b){return b?gcd(b,a%b):a;}
long lcm(long a,long b){return a*b/gcd(a,b);}


int main() {
	
	long long int n,a,b,c;
	cin>>n;
	cin>>a>>b>>c;
	int y=0;
	y+=n/a+n/b+n/c;
	y-=n/lcm(a,b)+n/lcm(a,c)+n/lcm(b,c)-n/lcm(lcm(a,b),c);
	cout<<y<<endl;

	return 0;
}