file = open('9A.txt')
A = list(map(int, file.readlines()))
count = 0
for i in range(len(A)):
    for j in range(i + 1, len(A)):
        if (A[i] + A[j]) == 2000:
            count += 1
print(count)

file = open('9B.txt')
A = list(map(int, file.readlines()))
count = 0
k = [0] * 2000
for i in range(len(A)):
    ost = (2000 - A[i] % 2000) % 2000
    count += k[ost]
    k[A[i]%2000] += 1
print(count)