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# Uses python3
import sys
def getLCS2Length(a, b):
m = len(b)
n = len(a)
D = [[0 for _ in range(m + 1)] for _ in range(n + 1)]
for j in range(1, m + 1):
for i in range(1, n + 1):
if a[i - 1] == b[j - 1]:
D[i][j] = D[i - 1][j - 1] + 1
else:
D[i][j] = max(D[i - 1][j], D[i][j - 1])
return D[n][m]
if __name__ == '__main__':
input = sys.stdin.read()
data = list(map(int, input.split()))
n = data[0]
data = data[1:]
a = data[:n]
data = data[n:]
m = data[0]
data = data[1:]
b = data[:m]
print(getLCS2Length(a, b))
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