mod = 1000000007
eps = 10**-9


def main():
    import sys
    from math import floor
    input = sys.stdin.readline

    a, b = map(int, input().split())
    A = (a * 30 + b * 0.5)%360
    B = (b * 6)%360
    if A == B:
        print(0)
    elif A > B:
        print(floor((A - B) / (5.5 / 60)))
    else:
        print(floor((360 + A - B) / (5.5 / 60)))


if __name__ == '__main__':
    main()