#include <bits/stdc++.h>
#define FOR(i,a,b) for(int i = (a); i < (b); ++i)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) for(int i = (n) - 1; (i) >= 0; --i)
#define SZ(n) (int)(n).size()
#define ALL(n) (n).begin(), (n).end()
#define MOD LL(1e9 + 7)
#define INF 1000000
using namespace std;
typedef long long LL;
typedef vector<int> VI;
typedef pair<int, int> PI;

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

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

int main() {
	int n, a, b, c;
	cin >> n >> a >> b >> c;
	LL ans = (n / a) + (n / b) + (n / c);
	ans += n / lcm(a, lcm(b, c));
	ans = ans - n / lcm(a, b) - n / lcm(b, c) - n / lcm(c, a);
	cout << ans << endl;
	return 0;
}