#include<bits/stdc++.h>
#define int long long
using namespace std;

ifstream f("divk.in");
ofstream g("divk.out");

int v[500002],s[500002];

signed main()
{
    int k,a,b,i,n,contor=0,j;
    f>>n>>k>>a>>b;
    for(i=1;i<=n;i++)
    {
        f>>v[i];
        s[i]=s[i-1]+v[i];
    }
    for(i=1;i<=n;i++)
    {
        for(j=i+a-1;j<=i+b-1 && j<=n;j++)
        {
            if((s[j]-s[i-1])%k==0)
                contor++;
        }
    }
    g<<contor;
    return 0;
}