新手适合EZ!!!!!!!!!!!!!!

#include<iostream>
using namespace std;
int main(){
int n;
cin>>n;
if(n<=100){
cout<<n;
}else if(n<=200 && n>=101){
cout<<n-10;
}else if(n<=300 && n>=201){
cout<<n-20;
}else if(n<=500 && n>=301){
cout<<n-50;
}
return 0;
}