#include <bits/stdc++.h>
using namespace std;
int N,K,A,B,v[500001],i,j,nr,k;
long long s;
int main()
{
    freopen("divk.in","r",stdin);
    freopen("divk.out","w",stdout);
    scanf("%d%d%d%d",&N,&K,&A,&B);
    for(i=1;i<=N;++i)
        scanf("%d",&v[i]);

    for(i=1;i<=N;++i)
        for(j=1;j<=i;++j)
            if(i-j+1>=A && i-j+1<=B){
                s=0;
                for(k=j;k<=i;++k)
                    s+=v[k];
                    if(!(s%K))++nr;
            }

    printf("%d",nr);
}