#!/usr/bin/python3
total1=0
total2=0
for i in range(2,101):
if i%2==0 :
total1+=i
else: total2+= -i
total=total1+total2
print(total)
#!/usr/bin/python3
total1=0
total2=0
for i in range(2,101):
if i%2==0 :
total1+=i
else: total2+= -i
total=total1+total2
print(total)
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