#include<cstdio>
#define dim 500001
using namespace std;
long long  sum[dim],rez;
int a,b,k,n;
inline void citire()
{
	freopen("divk.in","r",stdin);
	scanf("%d%d%d%d",&n,&k,&a,&b);
	for(int i=1;i<=n;++i)
	{
		long s;
		scanf("%ld",&s);
		sum[i]=sum[i-1]+s;
	}
}
inline void rezolva()
{
	for(int i=1;i<n;++i)
		for(int j=i+1;j<=n;++j)
			if( j-i+1>=a && j-i+1<=b && (sum[j]-sum[i-1])%k==0 )
				++rez;
	freopen("divk.out","w",stdout);
	printf("%lld",rez);
}
int main()
{
	citire();
	rezolva();
}