def main():
    i = input()
    lst = i.split(' ')
    A,B = int(lst[0]),int(lst[1])
    if A < 23 and 25 < B:
        print(0)
    if A < 23 and 22 < B < 26:
        print(25-B)
    if A < 23 and B < 23:
        print (3)
    if 22 < A < 26 and B < 26:
        print (25-A)
    if 26 < A :
        print(3)


if __name__ == '__main__':
    main()