a = float(input()) if 500 > a and a >= 100: b = a * 0.9 elif 2000 > a and a >= 500: b = a * 0.8 elif 5000 > a and a >= 2000: b = a * 0.7 elif a >= 5000: b = a * 0.6 else: b = a print('%.1f' % b)