#include <iostream>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <cstdio>
#include <cstring>
#include <string>
#include <math.h>
using namespace std;
typedef long long ll;
typedef double D;
typedef pair<int,int> P;
#define M 1000000007
#define F first
#define S second
#define PB push_back
#define INF 100000000000000000
ll n,a,b,c;
ll gcd(ll x,ll y){
	if(x<y)swap(x,y);
	if(x%y==0)return y;
	return gcd(y,x%y);
}
ll lca(ll x,ll y){
	return x*y/gcd(x,y);
}
int main(void){
    cin>>n>>a>>b>>c;
    cout<<n/a+n/b+n/c-n/lca(a,b)-n/lca(b,c)-n/lca(c,a)+n/lca(lca(a,b),c)<<endl;
}