import math
final = 0
x = int(input())
y = int(input())
if x > y:
    for num in range(x, y-1, -1):
        print(num)
        if num != x and num != y:
            if num % 2 != 0:
                final += num
elif x < y:
    for num in range(x, y+1):
        print(num)
        if num != x and num != y:
            if num % 2 != 0:
                final += num
print(final)