n, m, k = map(int, input().split())

row = []
r = list(input().split())
opt = r[0]

for i in r[1:]:
    row.append(int(i))

cnt = 0
for i in range(n):
    c = int(input())
    if opt == "+":
        for j in range(len(row)):
            t = c + row[j]
            if t >= k:
                cnt += 1
    else:
        for j in range(len(row)):
            t = c * row[j]
            if t >= k:
                cnt += 1

print(cnt)