1132.py

X = int(input())
Y = int(input())

addition = 0

if X > Y:
    for data in range(Y, X + 1):

        if data % 13 != 0:
            addition += data

    print(addition)

if Y > X:
    for data in range(X, Y + 1):

        if data % 13 != 0:
            addition += data

    print(addition)