#include <bits/stdc++.h>
#define FOR(i,bg,ed) for(ll i=(bg);i<(ed);i++)
#define REP(i,n) FOR(i,0,n)
#define MOD 1000000007
#define int long long
using namespace std;
typedef long long ll;
typedef vector<vector<ll>> mat;
const int INF = 1e9;

int gcd(int a, int b)
{
    if (b == 0) return a;
    return gcd(b, a % b);
}

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

signed main()
{
    int N;
    int a, b, c;
    cin >> N;
    cin >> a >> b >> c;

    cout << N/a + N/b + N/c - N/lcm(a,b) - N/lcm(a,c) - N/lcm(b,c) + N/lcm(a,lcm(b,c)) << endl;
}