#include <iostream>
#include <math.h>
using namespace std;
long long int nod(long long int a,long long int b) {
	if (b < a) {
		int r = b;
		b = a;
		a = r;
	}
	while (a > 0) {
		b -= a;
		if (b < a) {
			int r = b;
			b = a;
			a = r;
		}
	}
	return b;
}

long long int nok(long long int a, long long int b) {
	if (a > 1e9 || b > 1e9) return 1000000001;
	else
	return a * b / nod(a, b);

}

int main() {
	long long int k, l, m, n, i = 1, p = 0;
	cin >> k >> l >> m >> n;
	p = n / k + n / l + n / m - n / nok(k, l) - n / nok(m, l) - n / nok(k, m) + n / nok(nok(m, k), l);
	cout << p;

	return 0;
}