#include <stdio.h>
#include <stdlib.h>
long long s[500002],n,i,k,a,b,nr,c,j;
int main()
{
    freopen("divk.in","r",stdin);
    freopen("divk.out","w",stdout);
    scanf("%lld%lld%lld%lld",&n,&k,&a,&b);
    for(i=1; i<=n; i++)
     {
         scanf("%lld",&nr);
         s[i]+=s[i-1]+nr;
     }

    for(i=2; i<=n+1; i++)
     for(j=i; j<=n; j++)
      if((j-(i-2))>=a && (j-(i-2)<=b))
       if(abs(s[i-1]-s[j])%k==0) c++;
    printf("%lld",c);
    return 0;
}