С2

k = [int(i) for i in input().split()]
k.sort()
p = list(map(int, input().split()))
p.sort()
res = 0

i = 0
j = 0

while (i < len(k) and j < len(p)):
    if (p[j] <= k[i]):
        res += 1
        j += 1
    i += 1

print(res)