# https://yukicoder.me/problems/no/3579


def main():
    N, P, C = map(int, input().split())
    A = list(map(int, input().split()))

    array = []
    prev = False
    for a in A:
        if a % P != 0:
            if not prev:
                array.append([a])
            else:
                array[-1].append(a)
            prev = True
        else:
            prev = False

    if C == 0:
        ans = 0
        for x in array:
            ans += (len(x) * (len(x) + 1)) // 2
        
        total = (N * (N + 1)) // 2
        print(total - ans)
    else:
        answer = 0
        inv_c = pow(C, P - 2, P)
        for x_array in array:
            p_map = {1: 1}
            cum_p = 1

            for a in x_array:
                cum_p *= a
                cum_p %= P

                x = (cum_p * inv_c) % P
                if x in p_map:
                    answer += p_map[x]
                
                if cum_p not in p_map:
                    p_map[cum_p] = 0
                p_map[cum_p] += 1
        print(answer)






if __name__ == "__main__":
    main()