题解

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