#include<iostream>
using namespace std;
typedef long long int LL;
LL gcd(LL x,LL y){
    if(x<y)return gcd(y,x);
    if(y==0)return x;
    return gcd(y,x%y);
}
LL lcm(LL x,LL y){
    return x*y/gcd(x,y);

}
int main(){
    LL n;
    LL a,b,c;
    cin>>n>>a>>b>>c;
    LL x=n/a+n/b+n/c-n/lcm(a,b)-n/lcm(b,c)-n/lcm(c,a)+n/lcm(a,lcm(b,c));
    cout<<x<<endl;

    return 0;
}