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

# Calculate the angles of the hour and minute hands
hour_angle = (A % 12) * 30 + B * 0.5
minute_angle = B * 6

# Compute the angle difference modulo 360 to get the smallest positive difference
delta = (hour_angle - minute_angle) % 360

# Check if the hands are already aligned
if abs(delta) < 1e-9:
    print(0)
else:
    # Calculate the required time in minutes and convert to seconds
    t_minutes = delta / 5.5
    total_seconds = t_minutes * 60
    print(int(total_seconds))