哪里错了```cpp
#include
#include
using namespace std;
int main(){
double a=0;
int n;
cin>>n;
if(n<=150){
a=n0.4463;
}else if(151<=n<=400){
a=1500.4463+(n-150)0.4663;
}else{
a=1500.4463+250*0.4663+(n-400)*0.5663;
}
cout<<fixed<<setprecision(1)<<a;
return 0;
}
