题解

#include <bits/stdc++.h>
using namespace std;
int main(){
    int x;
    cin>>x;
    if(x<100)cout<<x;
    else if(x>=200){
        x-=50;
        if(x>=100)x-=20;
        cout<<x;
    }
    else cout<<x-20;
	return 0;}