#include "bits/stdc++.h"
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
#define REP(i,a) for(int i=0;i<a;i++)
typedef long long ll;
typedef pair<int, int> PI;
typedef pair<int, PI> V;
typedef vector<int> VE;
const ll mod = 1000000007;

//最大公約数
ll gcd(int m,int n){
  if((m==0)||(n==0))return 0;

  while(m!=n){
    if(m>n)m=m-n;
    else n=n-m;
  }
  return m;
}

//最小公倍数
ll lcm( int m, int n )
{
	if ( ( 0 == m ) || ( 0 == n ) )
		return 0;

	return ((m / gcd(m, n)) * n);
}


int main() {
  ll n;
  int a,b,c;
  cin>>n;
  cin>>a>>b>>c;
  int ta,tb,tc;
  ll tab,tbc,tca,tabc;
  ta=n/a;
  tb=n/b;
  tc=n/c;
  tab=n/lcm(a,b);
  tbc=n/lcm(b,c);
  tca=n/lcm(c,a);
  tabc=n/lcm(lcm(a,b),c);
  print(ta+tb+tc-tab-tbc-tca+tabc);
}