# 時計の長針と短針

A, B = map(int, input().split())

eps = 10 ** (- 10)

arg_h = (A % 12) * 30 + B * 0.5
arg_m = B * 6

move_h = 360 / 12 / 3600 
move_m = 360 / 60 / 60 

ans = int(((arg_h - arg_m) % 360) / (move_m - move_h) + eps)

print(ans)