PyPy large memory usage compared to CPython

I used python to solve SPOJ's large input test problem and met with a very strange occurrence. I submitted the same code using PyPy and Python 2. The results are shown below:

The code ran much faster using PyPy compared to CPython, as expected. But at the same time, the memory usage increased by a whopping 7 times! I did a search on the web but I was unable to find any evidence that suggests that PyPy's memory usage is much more than CPython. Could somone please explain the huge difference in memory usage?

I have also considered that it could be because of my code. Hence, I have posted my code below:

import io, sys, atexit, os
sys.stdout = io.BytesIO()
atexit.register(lambda: sys.__stdout__.write(sys.stdout.getvalue()))
sys.stdin = io.BytesIO(sys.stdin.read())
raw_input = lambda: sys.stdin.readline().rstrip()

line = list(map(int,raw_input().split()))
num, k = line
ans = 0

for i in xrange(0,num):
    if int(raw_input())%k == 0:
        ans += 1;

print(ans) 

Could someone please advise me?