import sys
from math import sqrt, pi, sin, factorial
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = " " : [*map(int,inp().split(x))]
mfi = lambda x = " " : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
n, s = mii()
l = mii()
k = s * max(l)
return k // 1000 + int(k % 1000 > 0)
if __name__ == "__main__":
tc = ii()
for t in range(1, tc+1):
ret = solve()
p(ret)