题解

#include<bits/stdc++.h>
using namespace std;
int main(){
    int x;
    cin >> x;
    if(x>=300){
        cout << "100";
    }else if(x>=200){
        cout << "50";
    }else if(x>=100){
        cout << "20";
    }else{
        cout << "0";
    }
    return 0;
}