#!/usr/bin/env python3
# %%
import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines


# %%
import numpy as np

# %%
N, M, K = map(int, readline().split())
op = read(1).decode()
BA = np.array(read().split(), np.int64)

# %%
B = BA[:M]
A = BA[M:]

# %%
A.sort()
B.sort()

# %%
if op == '+':
    answer = np.sum(N - np.searchsorted(A, (K - B)))
else:
    answer = np.sum(N - np.searchsorted(A, (K + B - 1) // B))
print(answer)