#include<bits/stdc++.h>
using namespace std;
int a,b,c,d;
int main(){
    cin>>a;
    b=50;
    c=100;
    d=200;
    if(a>=200&&a<=299){
        cout<<a+b;
    }if(a<=499&&a>=300){
        cout<<a+c;
    }if(a>=500){
        cout<<a+d;
    }if(a<200){
        cout<<a;
    }
}
/**************************************************************
	Problem: 1391
	User: chenyichuen
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2072 kb
****************************************************************/