#include <fstream>
using namespace std;
ifstream fin("divk.in");
ofstream fout("divk.out");
int N,K,A,B,sp[500005],sol,i,j;

void read()
{
    fin>>N>>K>>A>>B;
    for(i=1;i<=N;i++)
    {
        int x;
        fin>>x;
        sp[i]=sp[i-1]+x;
    }
}

void solve()
{
    for(i=1;i<=N-A+1;i++)
    {
        for(j=i+A;j<i+B;j++)
        {
            if((sp[j]-sp[i-1])%K==0){sol++;}
        }
    }
}

void print()
{
    fout<<sol<<"\n";
}
int main()
{
    read();
    solve();
    print();
    return 0;
}