a,b=input().split()
if a[0]=="0":
    a=int(a[1])
else:
    a=int(a)
if b[0]=="0":
    b=int(b[1])
else:
    b=int(b)
num1=((a*30)+(0.5*b))%360
num2=6*b
if num1>num2:
    print(int((num1-num2)/(5.5/60)))
elif num1==num2:
    print(0)
else:
    num1+=360
    print(int((num1-num2)/(5.5/60)))