# a, b, c=input().split()
# a = int(a)
# b = int(b)
# c = int(c)
# h = (b if a<b else a) if (b if a<b else a)>c else c
# if h==a:
# if h<(b+c):
# print('yes')
# else:
# print('no')
# elif h==b:
# if h<(a+c):
# print('yes')
# else:
# print('no')
# elif h==c:
# if h<(a+b):
# print('yes')
# else:
# print('no')
# a, b, c=input().split()
# a = int(a)
# b = int(b)
# c = int(c)
#
# if a>b:
# t = a
# a = b
# b = t
# if b>c:
# t = b
# b = c
# c = t
#
# if a+b > c:
# height, weight = input().split()
# height = float(height)
# weight = float(weight)
# b = (height-100)*0.9
# a = (weight-b)*100/b
# if a<=10:
# print('정상')
# elif 10<a and a <=20:
# print('과체중')
# elif a>20:
# print('비만')
# h, w = input().split()
# h = float(h)
# w = float(w)
# if 150>h:
# b = h-100
# elif 150<=h and 160>h:
# b = (h-150)/2+50
# elif 160<=h:
# b = (h-100)*0.9
# a = (w-b)*100/b
# if a<=10:
# print('정상')
# elif a>10 and a<=20:
# print('과체중')
# elif a>20:
# print('비만')
# for i in range(5):
# print(i)
# for i in range(5, 10):
# print(i)
# for i in range(10, 5, -1):
# print(i)
# for i in range( , , ):
# a, b = input().split()
# a = int(a)
# b = int(b)
# if a<b:
# for i in range(a, (b+1)):
# print(i)
# else:
# for i in range(b, (a+1)):
# print(i)
# s = 0
#
# for i in range(1, 101):
# s += i
#
# print(s)
# n = int(input())
# for i in range(1, n):
# n += i
# print(n)
n = int(input())
s=0
for i in range(1, n+1):
if i%2==0:
s += i
print(s)
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