#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
using namespace std;

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

int lcm(int a, int b){
    return (a * b) / gcd(a, b);
}

int main(){
    int n, a, b, c, x;
    cin >> n >> a >> b >> c;
    
    x = ((n/a)+(n/b)+(n/c))-(n/lcm(a,b)+n/lcm(b,c)+n/lcm(c,a)) + n/lcm(lcm(a,b),c);

    cout << x;
}