#include <iostream>

using namespace std;

long ggd(long x, long y)
{
	if (y==0) return x;
	return ggd(y, x%y);
}
long lcm(long x, long y)
{
	return (x * y) / ggd(x, y);
}
int main(int argc, char** argv)
{
	long n, a, b, c;
	cin >> n >> a >> b >> c;

	long rs = 0;
	rs += (n/a)+(n/b)+(n/c);
	rs -= ((n/lcm(a, b))+(n/lcm(b, c))+(n/lcm(a, c)));
	rs += (n/lcm(lcm(a,b), c));
	cout << rs << endl;
	return 0;
}