s=input().split()
dianfei=int(s[0])
qian=0
a=0
if 0<a & a<150:
    qian=dianfei*0.4463
elif dianfei > 150 & dianfei <= 400:
    qian=150*0.4463+(dianfei-150)*0.4663
elif dianfei > 400: 
    qian=150*0.4463+250*0.4663+(dianfei-400)*0.5663;
print("%.1f"% qian)

输入501，输出230.6，怎么回事？