#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
ll gcd(int a,int b){
    if(b)return gcd(b,a%b);
    return a;
}
ll lcm(ll a,ll b){
    return a/gcd(a,b)*b;
}
main(){
    ll N,a,b,c;
    scanf("%lld%lld%lld%lld",&N,&a,&b,&c);
    printf("%lld\n",N/a + N/b + N/c - (N/lcm(a,b) + N/lcm(b,c) + N/lcm(c,a))+N/lcm(lcm(a,b),c));
}