#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (ll i = (ll)a; i < (ll)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF (1LL<<25)     //33554432
#define PI 3.14159265359
#define EPS 1e-12
#define int ll

signed main(void)
{
  int n, a, b, c;
  cin >> n >> a >> b >> c;
  bool bb = true, cc = true;
  if(b%a == 0) bb = false;
  if(c%a == 0) cc = false;
  if(c%b == 0) cc = false;

  if(bb && cc) {
    int t1 = a, t2 = b, t3 = b, t4 = c, t5 = a, t6 = c;
    while(t1 != 0) {int tmp = t1; t1 = t2 % t1; t2 = tmp;}
    while(t3 != 0) {int tmp = t3; t3 = t4 % t3; t4 = tmp;}
    while(t5 != 0) {int tmp = t5; t5 = t6 % t5; t6 = tmp;}
    int t7 = min(t2, t4), t8 = min(t2, t4);
    while(t7 != 0) {int tmp = t7; t7 = t8 % t7; t8 = tmp;}
    //cout << t2 << " " << t4 << " " << t6 << " " << t8 << endl;
    //cout << n/a << " " << n/b << " " << n/c << endl;
    //cout << n/(a*b/t2) << " " << (n/t4)/((b/t4)*(c/t4)) << " " << (n/t6)/((c/t6)*(a/t6)) << " " << (n/t8)/((a/t8)*(b/t8)*(c/t8)) << endl;
    cout << n/a + n/b + n/c - n/(a*b/t2) - n/(b*c/t4) - n/(c*a/t6) + (n/t8)/((a/t8)*(b/t8)*(c/t8)) << endl;
  } else if(bb && !cc) {
    int t1 = a, t2 = b;
    while(t1 != 0) {int tmp = t1; t1 = t2 % t1; t2 = tmp;}
    n /= t2; a /= t2; b /= t2;
    cout << n/a + n/b - n/(a*b) << endl;
  } else if(!bb && cc) {
    int t1 = a, t2 = c;
    while(t1 != 0) {int tmp = t1; t1 = t2 % t1; t2 = tmp;}
    n /= t2; a /= t2; c /= t2;
    cout << n/a + n/c - n/(a*c) << endl;
  } else if(!bb && !cc) {
    cout << n/a << endl;
  } else {
    assert(false);
  }

  return 0;
}