a,b=map(int,input().split())
a%=12
nowa= ((a*60*60)+(b*60)) * (360/43200)
nowb= b * 360/60
if nowa > nowb:sa=abs(nowa-nowb)
else:sa=abs(360-nowb + nowa)

if nowa%360==nowb%360:print(0)
else:print(int(sa / (360/3600 - 360/43200) + 0.001))