def f(n):
    i = 0
    while i < n:
        j = 0
        while j < 1000:
            print(str(i) + ", " + str(j))
            j += 1
        i += 1

2: c_1
3, 4, 8: c_2
5, 6, 7: c_3

Line 2, run one time.
Lines 3, 4, 8, run n times.
Lines 5, 6, 7, run 1000 times for each execution of the outer loop, so 1000n times.

Runtime is

c_1 + c_2 n + c_3 1000 n

or

Theta(n)