import sys
input = sys.stdin.readline

from collections import Counter

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

Z=[]
for i in range(N):
    if A[i]==0:
        Z.append(i)

ANS=0
if C==0:
    ind=0

    for i in range(N):
        if ind==len(Z):
            break
        if Z[ind]<i:
            ind+=1
        if ind==len(Z):
            break

        ANS+=N-Z[ind]

    print(ANS)

else:
    LIST=[]
    X=[]
    for i in range(N):
        if A[i]==0:
            if X!=[]:
                LIST.append(X)
                X=[]
            else:
                X=[]
        else:
            X.append(A[i])

    if X!=[]:
        LIST.append(X)

    #print(LIST)

    for L in LIST:
        S=[1]
        now=1
        for x in L:
            now=now*x%P
            S.append(now)

        CA=Counter(S)

        for s in S:
            CA[s]-=1

            need=C*pow(s,P-2,P)%P

            ANS+=CA[need]

    print(ANS)