#include <stdio.h>

#define A (a*b/gcd(a,b))
#define B (b*c/gcd(b,c))
#define C (a*c/gcd(a,c))
#define D (A*c/gcd(A,c))

long gcd(long x,long y)
{
	long r;
	if(y>x){
		r=x;
		x=y;
		y=r;
	}
	while(y>0){
		r=x%y;
		x=y;
		y=r;
	}
	return x;
}

int main(void)
{
	long n,a,b,c;
	scanf("%ld%ld%ld%ld",&n,&a,&b,&c);
	printf("%ld",n/a+n/b+n/c-n/A-n/B-n/C+n/D);
	return 0;
}