#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;
}

#include<bits/stdc++.h>
using namespace std;
long long m,a,b,c,g,ab,ac,bc,abc;
int main(){
    cin>>m>>a>>b>>c;
    g=__gcd(a,b);ab=a/g*b;
    g=__gcd(a,c);ac=a/g*c;
    g=__gcd(b,c);bc=b/g*c;
    g=__gcd(ab,c);abc=ab/g*c;
    cout<<m-m/a-m/b-m/c+m/ab+m/ac+m/bc-m/abc;
}