#include <fstream>
using namespace std;
ifstream cin("divk.in");
ofstream cout("divk.out");
int n, k, a, b, v[500001], p[500001], sol;
int main()
{
    cin >> n >> k >> a >> b;
    for (int i = 1; i <= n; ++i)
        cin >> v[i], p[i] = p[i - 1] + v[i];
    for (int i = 1; i <= n - a + 1; ++i)
    {
        for (int j = a; j <= b; ++j)
        {
            if (i + j - 1 <= n)
            {
                if ((p[i + j - 1] - p[i - 1]) % k == 0)
                    ++sol;
            }
        }
    }
    cout << sol;
    return 0;
}