#include <bits/stdc++.h>
using namespace std;
int main(){
	int n;
	cin>>n;
	if(n<200) cout<<n;
	if(n>=200&&n<=299) cout<<n+50;
	if(n>=300&&n<=499) cout<<n+100;
	if(n) 
	
	
	
}










 
/**************************************************************
	Problem: 1391
	User: zhuangwenya
	Language: C++
	Result: Compile Error
****************************************************************/