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#include 
   
    using namespace std;typedef long long ll;int main(){   	ll l1,r1,t1,l2,r2,t2;	scanf("%lld %lld %lld",&l1,&r1,&t1);	scanf("%lld %lld %lld",&l2,&r2,&t2);	ll d=__gcd(t1,t2);	if(abs(l2-l1)%d==0) {   		printf("%lld\n",min(r1-l1+1,r2-l2+1));		return 0;	}	ll d1=(l2-l1)%d,d2=(l1-l2)%d;	if(d1<0) d1+=d;	if(d2<0) d2+=d;	printf("%lld\n",max(1LL*0,max(min(r1-l1-d1+1,r2-l2+1),min(r1-l1+1,r2-l2-d2+1))));}