#include <fstream>
#include <stdio.h>
#include <iostream>
using namespace std;

fstream g("divk.out" ,ios::out);

int main()
{
    int n,k,a,b,v[500001];
    long long count=0;
    FILE *pFile;
    pFile = fopen ("divk.in","r+");
    fscanf(pFile, "%d%d%d%d",&n,&k,&a,&b);
    for(int i=1;i<=n;i++)
    {
        int x;
        fscanf(pFile, "%d",&x);
        v[i]=x;
    }
    for(int i=1;i<=n;i++)
    {
            int sum=0;
            for(int j=i;j<=n && j-i<b;j++)
            {
                sum+=v[j]%k;
                sum%=k;
                if (sum==0 && j-i+1>=a )
                    count++;
            }
    }

    g<<count<<endl;
    return 0;
}