#include <iostream>

using namespace std;
int nr,n,i,k,a,b,st,dr,v[500005],s[500005],j,sum;
int main()
{
    cin>>n>>k>>a>>b;
    for(i=1; i<=n; i++)
    {
        cin>>v[i];
        s[i]=s[i-1]+v[i];
        if(v[i]==a&&nr==0)
        {
            st=i;
            nr++;
        }
        if(v[i]==b)
        {
            dr=i;
        }
    }
    nr=0;
    for(i=st; i<=dr; i++)
    {
        for(j=st; j<=i; j++)
        {
            sum=s[i]-s[j-1];
            if(sum%k==0&&i!=j&&i-j+1!=n)
            {
                nr++;
                ///cout<<i<<" "<<j<<"\n";
            }
        }
    }
    cout<<nr;
    return 0;
}