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