#include <bits/stdc++.h>
using namespace std;

long long gcd(long long a, long long b)
{
    while (b != 0)
    {
        long long temp = b;
        b = a % b;
        a = temp;
    }
    return a;
}

long long lcm(long long x, long long y)
{
    return (x / gcd(x, y)) * y;
}

int main()
{
    long long int n = 0;
    cin >> n;
    int a = 0, b = 0, c = 0;
    cin >> a >> b >> c;
    int countA = n / a;
    int countB = n / b;
    int countC = n / c;
    int countAB = n/lcm(a,b);
    int countBC = n/lcm(b,c);
    int countAC =n/lcm(a,c) ;
    int countABc = n/lcm(a,lcm(b,c));
    cout << countA + countB + countC - countAB - countBC - countAC + countABc << endl;
}