a=int(input()) b=0.6*a c=0.7*a d=0.8*a e=(“%.1f”%b)#% f=(“%.1f”%c)#% g=(“%.1f”%d)#% h=(“%.1f”%a)#% if a>=4000: print(e) else: if a>=3000: print else:(f) if a>=2000: print(g) else: print(h)