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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("divk.in");
ofstream fout("divk.out");
long long v[500005], d[100005];
int main()
{
int n, k, a, b, x;
long long s = 0;
fin >> n >> k >> a >> b;
for (int i = 1; i <= n; i++)
{
fin >> x;
v[i] = v[i - 1] + x;
}
for (int i = 1; i + a <= n; i++)
{
d[v[i] % k]++;
if (i - b + a > 0)
d[v[i - b + a] % k]--;
s += d[v[i + a] % k];
}
fout << s << '\n';
return 0;
}