#include<bits/stdc++.h>
using namespace std;
int main(){
	int n,a,b,c;
	cin>>n;
	a=n+50;
	b=n+100;
	c=n+200;
	if(n>=200 && n<=299)
		cout<<a;
	if(n>=300 && a<=499)
		cout<<b;
	if(n>=500)
		cout<<c;		
	 
		
	return 0;
}
/**************************************************************
	Problem: 1391
	User: cyp
	Language: C++
	Result: Wrong Answer
****************************************************************/