import sys
n, m, k = map(int, input().split())
op, *B = input().split()
print(sum(s*i for i, (_, s) in enumerate(sorted(
    [({"+":k-int(a), "*":(k-1)//int(a)+1}[op], 0) for a in sys.stdin] +
    [(int(b), 1) for b in B]))) - m*(m-1)//2)