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

int n,k,a,b,v[500010],ans;

int main()
{
    ifstream cin("divk.in");
    ofstream cout("divk.out");
    cin>>n>>k>>a>>b;
    for(int i=1;i<=n;i++)
    {
        cin>>v[i];
        v[i]+=v[i-1];
    }
    for(int i=a;i<=b;i++)
        for(int j=i;j<=n;j++)
        {
            if(!((v[j]-v[j-i])%k)) ans++;
        }
        cout<<ans;
    return 0;
}