#include<stdio.h>
long int yakusu(int a,int b){
	long int c;
	c = b%a;
	while(c!=0){
		b = a;
		a = c;
		c = b%a;
	}
	return a;
}
int main(void){
	long long int n,ans;
	long long int a,b,c;
	scanf("%lld%lld%lld%lld",&n,&a,&b,&c);
	ans = n/a + n/b + n/c 
					- (n/(a*b/yakusu(a,b)) + n/(b*c/yakusu(b,c)) + n/(a*c/yakusu(a,c))) 
					+ n/(a*b*c/yakusu(yakusu(a,b),c));
	printf("%lld\n",ans);
	return 0;
}