long n,a,b,c,s;
gcd(a,b){return b?gcd(b,a%b):a;}
main(){scanf("%d%d%d%d",&n,&a,&b,&c);
s=n/a-n/(a/gcd(a,b)*b)+n/b-n/(c/gcd(c,b)*b);
s+=n/c-n/(a*=c/gcd(a,c));
n=!printf("%d",s+n/(a/gcd(a,b)*b));
}