#!/usr/bin/env python3
import bisect
def main():
    h, w, k = map(int, input().split())
    op, *b = input().split()
    b = list(map(int, b))
    a = [ int(input()) for _ in range(h) ]
    a.sort()
    b.sort()
    c = 0
    if op == '+':
        for a_y in a:
            c += w - bisect.bisect_left(b, k - a_y)
    elif op == '*':
        for a_y in a:
            c += w - bisect.bisect_left(b, (k - 1) // a_y)
    print(c)
if __name__ == "__main__":
    main()