#include <stdio.h>

long long int gcd(long long int x, long long int y) {
	long long int i, z = (x < y ? x : y);
	for(i = z; 0 < i; i--) {
		if(x % i == 0 && y % i == 0) { return i; }
	}
}

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

int main(void) {
	long long int n, a, b, c;
	scanf("%lld%lld%lld%lld", &n, &a, &b, &c);
	
	long long int v = n/a + n/b + n/c;
	v -= n / lcm(a, b) + n / lcm(b, c) + n / lcm(c, a);
	v += n / lcm( lcm(a, b), c);
	printf("%lld\n", v);
	
	return 0;
}