#include "bits/stdc++.h"
using namespace std;

long long GCD(long long A, long long B) {
	if (B == 0) return A;
	return GCD(B, A % B);
}

int main() {
	long long N, A, B, C, AB, BC, CA, ABC;
	cin >> N >> A >> B >> C;
	AB = A / GCD(A, B) * B;
	BC = B / GCD(B, C) * C;
	CA = C / GCD(C, A) * A;
	ABC = A / GCD(A, BC) * BC;
	cout << N / A + N / B + N / C - N / AB - N / BC - N / CA + N / ABC << endl;
}