#include<stdio.h>
long x[500001];
long c[500001];
int main()
{
	freopen("divk.in","r",stdin);
	freopen("divk.out","w",stdout);
	long a,b,n,k,i,j,nr=0;
	scanf("%ld%ld%ld%ld",&n,&k,&a,&b);
	for(i=1;i<=n;i++)
	{
		scanf("%ld",&c[i]);
		x[i]=(x[i-1]+c[i])%k;
	}
	for(j=a;j<=b;j++)
		for(i=1;i<=n-j;i++)
			if(x[i+j]-x[i]==0)
				nr++;
	printf("%ld",nr);
return 0;
}