#a
a,b=list(map(int,input().split()))
t=[]
for i in range(a,b+1):
  if(i%2==1):
    t.append(i)
print(sum(t))

685096a7d8836d0dabcc02b9642ffe2b2b194411
<mask token>

<mask token>
for i in range(a, b + 1):
    if i % 2 == 1:
        t.append(i)
print(sum(t))

a, b = list(map(int, input().split()))
t = []
for i in range(a, b + 1):
    if i % 2 == 1:
        t.append(i)
print(sum(t))

#a
a,b=list(map(int,input().split()))
t=[]
for i in range(a,b+1):
  if(i%2==1):
    t.append(i)
print(sum(t))
