""""
a,b,c=map(int,input().split())
d=((89-a)//5)+1
if b+d > c:
print("win")
elif b+d == c:
print("same")
else :
print("lose")
a= int(input())
c = (2013 - a)
if 1999<c:
print(c-2000,3)
else :
print(c-1900,1)
a,b,c = map(int,input().split())
if a+b<=c:
print("삼각형아님")
elif a==b and a==c:
print("정삼각형")
elif a==b or a==c or c==b:
print("이등변삼각형")
elif a**2+b**2==c**2:
print("직각삼각형")
else :
print("삼각형")
반복문
while
for
"""
# while 조건식 :
# 명령
# while a!=0 :
# print('hello')
# if :
# break
# range(5) -> 0 ~ 5미만 1간격 -> 0 1 2 3 4
# range(1,5) -> 1 ~ 5미만 1간격 -> 1 2 3 4
# range(1,10,2) -> 1 ~ 10미만 2간격 -> 1 3 5 7 9
# for i in range(5) :
# print(i)
# for j in range(1,5) :
# print(j)
# for k in range(10,0,-1) : # 10 ~ 1초과 -1간격
# print(k)
"""
for i in range(1,101):
print(i)
a= int(input())
for i in range(1,a+1):
print(i)
a,b=map(int,input().split())
if a<b:
for i in range(a,b+1):
print(i)
elif a>b:
for i in range(b,a+1):
print(i)
else :
print(a)
a,b= map(int,input().split())
for i in range(a,b+1):
if(i%2 !=0):
print(i)
a=int(input())
c=0
for i in range(1,a+1):
c=c+i
print(c)
a=int(input())
c=0
for i in range(1,a+1):
if i%2==0:
c=c+i
print(c)
a,b=map(int,input().split())
c=0
for i in range(a,b+1):
if i%3==0:
c=c+i
print(c)
a=int(input())
c=0
for i in range(1,10):
c=a*i
print(str(a)+'*'+str(i)+'='+str(c))
a= int(input())
c=0
for i in range(1,a+1):
if i%10 ==1:
c=c+1
print(c)
a= int(input())
for i in range(1,a+1):
if a%i ==0:
print(i)
a= int(input())
c=0
for i in range(1,a+1):
if a%i==0:
c=c+1
if c==2:
print("prime")
else :
print("not prime")
a,b,c= map(int,input().split())
d=a+b*(c-1)
print(d)
a,b,c=map(int,input().split())
for i in range(c-1):
a=a*b
print(a)
a,b,c,d=map(int,input().split())
for i in range(1,d):
a=a*b+c
print(a)
a,b=map(int,input().split())
print(a**b)
a=int(input())
c=1
for i in range(a,0,-1):
c=c*i
print(c)
"""
a,b= map(int,input().split())
d=0
c=0
for i in range(a,b+1):
if i%2 ==0:
c=c+i
elif i%2!=0:
d=d+i
print(d-c)
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20241023
20241023
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