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


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

    if C == 0:
        array = []
        prev = False
        for a in A:
            if a % P != 0:
                if not prev:
                    array.append(1)
                else:
                    array[-1] += 1
                prev = True
            else:
                prev = False
        ans = 0
        for x in array:
            ans += (x * (x + 1)) // 2
        
        total = (N * (N + 1)) // 2
        print(total - ans)
    else:
        answer = 0
        p_map = {1: 1}
        cum_prod_a = 1
        inv_c = pow(C, P - 2, P)
        for a in A:
            cum_prod_a *= a
            cum_prod_a %= P

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



if __name__ == "__main__":
    main()