#include <iostream>
int f(int a, int b) {
	int big, small;
	if (a > b) {
		big = a;
		small = b;
	}
	else {
		big = b;
		small = a;
	}
	int i = 1;
	while (1) {
		if ((big*i) % small == 0) {
			break;
		}
		++i;
	}
	return big*i;
}
int main() {
	std::cin.tie(0);
	std::ios::sync_with_stdio(false);
	int n, a, b, c;
	std::cin >> n >> a >> b >> c;
	int ab = f(a, b);
	int bc = f(b, c);
	int ca = f(c, a);
	int abc = f(ab, c);
	std::cout << n / a + n / b + n / c - (n / ab + n / bc + n / ca) + n / abc << std::endl;
}