731 B | 705 chars
import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,input().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n, k, m = mii() # n 옷 색상 수, k: 옷 그룹 수, m: 세탁기 용량
groups = [mii()[1:] for _ in range(k)]
cnt = mii()
ans = 0
for group in groups:
c = 0
for cloth in group:
c += cnt[cloth - 1]
cnt[cloth - 1] = 0
ans += c // m + int(c % m > 0)
for c in cnt:
ans += c // m + int(c % m > 0)
print(ans)
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()