#include <cstdio>
#include <vector>
#include <fstream>
using namespace std;
 
ifstream fin("divk.in");
ofstream fout("divk.out");
 
int main(int argc, char *argv[]) {
  
    int k, a, b, n;
    fin >> n >> k >> a >> b;
		vector<int> sums;
    for (int i = 0; i < n; ++i) {
      int t;
      fin >> t;
			if (i == 0) {
				sums.push_back(t);
			} else {
				sums.push_back(sums[i - 1] + t);
			}
    }
     
    int s = 0, e = 0, c = 0, sum = 0;
     
		for (int e = 0; e < sums.size(); ++e) {
				for (int s = e - b + 1; s <= e - a + 1; ++s) {
					if (s >= 0 && (sums[e] - sums[s]) % k == 0) {
						++c;
					}  
				}
		}
		
    fout << c << endl;
    fout.close();
    return 0;
}