#55373: python
ka2453@cnc.km.edu.tw
(金湖國中Owen)
import sys
n=0
for i in sys.stdin:
a,b=map(int,i.split())
if a>0 and b>0:
n+=a%b
print(n)
import sys
n=0
for i in sys.stdin:
a,b=map(int,i.split())
if a>0 and b>0:
n+=a%b
print(n)