#include <stdio.h>

typedef long long ll;

ll calc(ll x, ll y)
{
	if( y == 0 ) return x;
	return calc( y, x%y );
}

ll calc2(ll x, ll y)
{
	ll z = calc( y, x%y );
	return (x/z) * (y/z) * z;
}

ll calc3(ll x, ll y, ll z)
{
	int i, c=1, cnt=1;
	while( cnt ) {
		cnt=0;
		for( i = 2; i <= x; i++) {
			if( !(x%i) && !(y%i) && !(z%i) ) {
				c *= i;
				x /= i; y /= i; z /= i;
				cnt++;
			}
		}
	}
	for( i = 2; i <= x; i++) {
		if( !(x%i) && !(y%i) ) {
			c *= i;
			x /= i; y /= i;
		}
	}
	for( i = 2; i <= x; i++) {
		if( !(x%i) && !(z%i) ) {
			c *= i;
			x /= i; z /= i;
		}
	}
	for( i = 2; i <= y; i++) {
		if( !(y%i) && !(z%i) ) {
			c *= i;
			y /= i; z /= i;
		}
	}
	return c*x*y*z;
}

int main(void)
{
	ll i, n, a, b, c, ab, bc, ac, abc, cnt=0;
	scanf("%lld %lld %lld %lld", &n, &a, &b, &c);

	if( a == 1 || b == 1 || c == 1 ){
		printf("%d\n", n);
		return 0;
	}

	ab = calc2(b, a);
	bc = calc2(c, b);
	ac = calc2(c, a);

	abc = calc3(a, b, c);

	printf("%lld\n", (n/a)+(n/b)+(n/c)-(n/ab)-(n/bc)-(n/ac)+(n/abc) );

	return 0;
}