from bisect import bisect_left

N,M,K = [int(zz) for zz in input().split()]
B = [zz for zz in input().split()]

s = B[0]
B = sorted([int(zz) for zz in B[1:]])

def calc(s,a,b):
    if s == '+':
        return b-a
    elif s == '*':
        return b/a

tmp = 0
for i in range(N):
    a = int(input())
    p = calc(s,a,K)
    tmp += M-bisect_left(B,p)

print(tmp)