sum = 0
sum1 = 0
for i in range(1, 100):
    if i % 2 == 1:
        sum += i
    else:
        sum -= i
print(sum + sum1)

e9131a85b9deffc5ea8db5f99e0a55c5f413fe38
<mask token>

<mask token>
for i in range(1, 100):
    if i % 2 == 1:
        sum += i
    else:
        sum -= i
print(sum + sum1)

sum = 0
sum1 = 0
for i in range(1, 100):
    if i % 2 == 1:
        sum += i
    else:
        sum -= i
print(sum + sum1)
