a,b = map(int, input().split())
if a >= 12:
    a -= 12

A = 360/12*a+30/60*b
B = 360/60*b

if A >= B:
    t = (A-B)*3600/330
    t = int(t)
else:
    t = (A-B+360)*3600/330
    t = int(t)
print(t)