#include "bits/stdc++.h"
using namespace std;
#define ll long long int
#define rep(i,n) for( int i = 0; i < n; i++ )
#define rrep(i,n) for( int i = n; i >= 0; i-- )
#define REP(i,s,t) for( int i = s; i <= t; i++ )
#define RREP(i,s,t) for( int i = s; i >= t; i-- )
#define dump(x)  cerr << #x << " = " << (x) << endl;
#define INF 2000000000
#define mod 1000000007
#define INF2 1000000000000000000
#define int long long

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

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

signed main(void)
{
    cin.tie(0);
    ios::sync_with_stdio(false);
	int N; cin >> N;
	int a, b, c;
	cin >> a >> b >> c;
	int times_a = N / a;
	int times_b = N / b;
	int times_c = N / c;
	int times_a_b = N / lcm(a, b);
	int times_a_c = N / lcm(a, c);
	int times_b_c = N / lcm(b, c);
	int times_a_b_c = N / lcm(lcm(a, b), c);
	cout << times_a + times_b + times_c - times_a_b - times_a_c - times_b_c + times_a_b_c << endl;

    return 0;
}