#include <bits/stdc++.h>
#include <cmath>
#include <climits>
#include <cstdio>

using namespace std;

#define endl '\n'
#define PB push_back
#define ALL(a)  (a).begin(),(a).end()
#define SZ(a) int((a).size())
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define RFOR(i,a,b) for (int i=(b)-1;i>=(a);i--)
#define REP(i,n)  FOR(i,0,n)
#define RREP(i,n) for (int i=(n)-1;i>=0;i--)
#define DEBUG(x) cout<<#x<<": "<<x<<endl
#define AALL(a,n) (a),(a)+(n)

typedef pair<int,int> P;
typedef long long int LL;
typedef unsigned long long ULL;
typedef pair<LL,LL> LP;

long long gcd(long long x, long long y){
	return y==0 ? x : gcd(y, x%y);
}

long long lcm(long long x, long long y){
	return x/gcd(x,y)*y;
}

int main()
{
	ios::sync_with_stdio(false);
	cin.tie(0);
	int N;
	int a[3];
	cin >> N;
	REP(i,3)	cin >> a[i];
	int ans = N/lcm(a[0],lcm(a[2],a[1]));
	REP(i,3){
		ans += N/a[i];
		ans -= N/lcm(a[(i+1)%3],a[(i+2)%3]);
	}
	cout << ans << endl;
	return 0;
}