#include <bits/stdc++.h>

using namespace std;
map <int, int> cnt;
int n, x, y;

int32_t main()
{
    cin >> n >> x >> y;
    int a [n];
    cin >> a [0];
    a [0] = a [0] % x;
    for (int i = 1; i < n; i++)
    {
        cin >> a [i];
        a [i] = (a [i] + a [i - 1]) % x;
    }
    int ans = 0;
    for (int i = 0; i < n; i++)
    {
        if (a [i] == y)
        {
            ans  += cnt [0] + 1;
            cnt [a [i]]++;
            continue;
        }
        if (a [i] > y)
        {
            ans += cnt [a [i] - y];
            cnt [a [i]]++;
            continue;
        }
        if (a [i] < y)
        {
            ans += cnt [a [i] + x - y];
            cnt [a [i]]++;
            continue;
        }
    }
    cout << ans;
}