#include<bits/stdc++.h>
using namespace std;
int main(){
	int a,b,c,d;
	cin>>a;
	b=a+50;
	c=a+100;
	d=a+200;
	if(a>=200&&a<=299){
		cout<<b;
	}if(a<=499&&a>=300){
		cout<<c;
	}if(a>=500){
		cout<<d;
	}if(a<200){
		cout<<a;
	}
}
/**************************************************************
	Problem: 1391
	User: sucongyi
	Language: C++
	Result: Accepted
	Time:22 ms
	Memory:2072 kb
****************************************************************/