from sys import stdin
n,m,k = map(int,stdin.readline().rstrip().split())
li = list(map(str,stdin.readline().rstrip().split()))
op = li[0]
b = [int(li[i]) for i in range(1,m+1)]
a = [int(stdin.readline().rstrip()) for _ in range(n)]
a.sort();b.sort()
pa = 0;pb = 0;point = 0
for i in a:
    for j in b:
        if op == "+":
            if i+j >= k:
                point += 1
        else:
            if i*j >= k:
                point += 1
print(point)