#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;

long long gcd(long long a, long long b){
    return b?gcd(b, a%b):a;
}

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

int main(){
    ll N, a, b, c;
    cin >> N >> a >> b >> c;
    ll x, y, z, xy, yz, zx, xyz;
    x = N / a;
    y = N / b;
    z = N / c;
    xy = N / lcm(a, b);
    yz = N / lcm(b, c);
    zx = N / lcm(c, a);
    xyz = N / lcm(a, lcm(b, c));
    ll ans = x + y + z - xy - yz - zx + xyz;
    cout << ans << endl;
}