#include<cstdio>
using namespace std;
int main()
{
	int n,k,a,b,s[150000],i,q,j;
long x;
FILE *f=fopen("divk.in","r");
FILE *g=fopen("divk.out","w");
fscanf(f,"%d%d%d%d",&n,&k,&a,&b);
q=0;
s[0]=0;
for(i=1;i<=n;++i)
    {
		fscanf(f,"%d",&x);
s[i]=x+s[i-1];
}
for(i=0;i<=n-1;++i)
    {
		for(j=i+a;j<=i+b&&j<=n;++j)     
		if(!((s[j]-s[i])%k))
            ++q; 
}
fprintf(g,"%d\n",q);
fclose(f);
fclose(g);
return 0;
}