//uncommon
#include<iostream>
#include<cmath>
using namespace std;
int main()
{

    long long a,b,n,d,i,j,c=0,br=0,nd,v;
cin>>a>>b>>n>>d;
for(i=a;i<=b;i++){
                  j=i;
                  v=i;
                             while(j>0){
                                        c=c*10+j%10;
                                        j=j/10;
                                        }
                                        nd=__gcd(i,c);
                                        v/=nd;
                                        c/=nd;
                                        if(v==n&&c==d&&c>v)br++;
                                        else{ v=0; c=0;}}
                                        cout<<br<<endl;
return 0;
}
