03. Speed Info

# скорост
# ако е до 10 вкл -> slow
# ако е до 50 вкл -> average
# ако е до 150 вкл -> fast
# ако е до 1000 вкл -> ultra fast
# ако е над 1000 -> extremely fast

speed = float(input())

if speed <= 10:
    print('slow')
elif speed <= 50:
    print('average')
elif speed <= 150:
    print('fast')
elif speed <= 1000:
    print('ultra fast')
else:
    print('extremely fast')