#include <algorithm>
#include <iostream>
#include <iomanip>
#include <cstring>
#include <string>
#include <cmath>
using namespace std;
long long a,b,p,q;
int n,d;
long long br;
long long cy;
int main()
{
    cin >> a >> b >> n >> d;
    for(p = a;p <= b;p++){
        if (p % n == 0){
            cy = p;
            q = 0;
            while (cy != 0){
                q = q * 10 + cy % 10;
                cy /= 10;
            }
            if(q % d == 0 && q/d == p/n)br++;
        }
    }
    cout << br << endl;
    return 0;
}