#2

sum = 0

for i in range(1, 101):

   sum += i

print(sum)

##########

#3

a = 1

b = 5

c = 1

if a == b or a == c or b == c:

   print("yes")

else:

   print("ERROR")

##########

#4

a = 5

b = 2

c = 3

if a + b == c or a + c == b or c + b == a:

   print("yes")

##########

#5

for i in range(1, 498):

   if i % 2 == 0:

       print(i, end = " ")

##########