#include "bits/stdc++.h"
#define REP(i,n,N) for(ll i=(n); i<(N); i++)
#define RREP(i,n,N) for(ll i=(N-1); i>=n; i--)
#define CK(n,a,b) (a)<=(n)&&(n)<(b)
#define p(s) cout<<(s)<<endl
#define first F
#define second S
typedef long long ll;
using namespace std;
const ll inf =1e9+7;

ll N;
ll a,b,c;
int main(){
    while(cin>>N>>a>>b>>c){
        ll numa = N/a;
        ll numb = N/b;
        ll numc = N/c;
        ll gab = a*b/__gcd(a,b);
        ll numab = N/gab;
        ll numbc = N/(b*c/__gcd(b,c));
        ll numca = N/(c*a/__gcd(a,c));
        ll numabc = N/(gab*c/__gcd(gab,c));
        p(numa+numb+numc-(numab+numbc+numca)+numabc);
    }
}