#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,h;
	cin>>n;
	if (n>=500){
		h=n+200;
	}
	else if (300<=n && n<=499){
		h=n+100;
	}
	else if (200<=n && n<=299){
		h=n+50;
	}
	else{
		h=n;
	}
	cout<<h<<endl;
	return 0;
}
/**************************************************************
	Problem: 1391
	User: xiaojingxuan
	Language: C++
	Result: Accepted
	Time:24 ms
	Memory:2072 kb
****************************************************************/