file = open('9.txt')
count = 0
for s in file:
    A = list(map(int, s.split()))
    A.sort()
    if (A[0] + A[1] == A[2] + A[3] or A[0] + A[3] == A[2] + A[1] or A[0] + A[2] == A[1] + A[3]) and A[3] < A[0] + A[1] + A[2]:
        count += 1
print(count)