N, M, K = map(int, input().split())

from bisect import bisect_left

B = input().split()
op = B[0]
B = list(map(int, B[1:]))
B.sort()
ans = 0
if op == '+':
    for i in range(N):
        a = int(input())
        
        ans += M - bisect_left(B, K - a)
    
else:
    for i in range(N):
        
        a = int(input())
        ans += M - bisect_left(B, (K - 1) // a + 1)
        
print(ans)