#include<bits/stdc++.h>
using namespace std;
int main(){
    int n, a, b, c;
    cin>>n;
	cin>>a>>b>>c;
	int count_a = n/a ,count_b = n/b, count_c = n/c;
	
    int ab = (a*b) / __gcd(a,b);
    int ac = (a*c) / __gcd(a,c);
    int bc = (b*c) / __gcd(b,c);
    int abc = (ab*c) / __gcd(ab,c);
    
    int result = count_a + count_b + count_c - (n/ab) - (n/ac) - (n/bc) + (n/abc);
    cout<< result <<endl;
}