#include <iostream>
#include <vector>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <limits.h>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <functional>
#include <stdio.h>
using namespace std;

long long MOD = 1000000007;

long long gcd( long long a, long long b ) {
    
    if ( b == 0 ) { return a; }
    
    gcd( b, a%b );
}

int main() {
    
    long long N;
    int a,b,c;
    cin >> N >> a >> b >> c;
    
    long long A = N/a;
    long long B = N/b;
    long long C = N/c;
        
    long long AB = N / (a * b / gcd(a,b));
    long long BC = N / (b * c / gcd(b,c));
    long long CA = N / (c * a / gcd(c,a));
    
    long long x = a * b / gcd(a,b);
    long long y = b * c / gcd(b,c);
    long long ABC = N / (x * y / gcd(x,y));
    
    cout << A+B+C-(AB+BC+CA)+ABC << endl;
    
    
    return 0;
}