import sys
input = sys.stdin.readline
N,M,K = map(int,input().split())
op,*B = input().split()
A = [int(input()) for i in range(N)]
B = [int(b) for b in B]
A.sort()

def is_ok(ai,op,b):
    if ai >= N: return True
    if ai < 0: return False
    return (A[ai]*b if op=='*' else A[ai]+b) >= K

ans = 0
for b in B:
    ok = N
    ng = -1
    while ok-ng > 1:
        m = (ok+ng)//2
        if is_ok(m,op,b):
            ok = m
        else:
            ng = m
    ans += N-ok

print(ans)