import sys

sys.setrecursionlimit(10 ** 8)

input = sys.stdin.readline


def main():
    A, B = [int(x) for x in input().split()]

    A_kakudo = (A * 30) + 30 * (B / 60)
    B_kakudo = B * 6

    diff = (A_kakudo - B_kakudo) % 360

    print(int((diff * 60) / 5.5))
    
    

if __name__ == '__main__':
    main()