03. Speed Info

# скорост
# скорост <= 10 -> slow
# 10 < скорост <= 50 -> average
# 50 < скорост <= 150 -> fast
# 150 < скорост <= 1000 -> ultra fast
# скорост > 1000 -> extremely fast

speed = float(input())
if speed <= 10:
    print('slow')
elif 10 < speed <= 50:
    print("average")
elif 50 < speed <= 150:
    print('fast')
elif 150 < speed <= 1000:
    print('ultra fast')
elif speed > 1000:
    print('extremely fast')