C :

#include<stdio.h>
void main()
{
	
	int m,z; 
	scanf("%d",&m);
	if(m>=200&&m<=299){
		z=m+50;
	}else if(m>=300&&m<=499){
		z=m+100;
	}else if(m>=500){
		z=m+200;
	}else if(m<200){
		z=m;
	}
	printf("%d",z);
	
 }
  

C++ :

#include <bits/stdc++.h>
using namespace std;

int main(){
	int n,r;
	cin>>n;
	if(n < 200){
		r = n;
	}else if(n >= 200 && n <= 299){
		r = n + 50;
	}else if(n >= 300 && n <= 499){
		r = n + 100;
	}else if(n >= 500){
		r = n + 200;
	}
	cout<<r<<endl;
    return 0;
}

Python :

a=int(input())
if a>=200 and a<=299:
    print(a+50)
elif a>=300 and a<=499:
    print(a+100)
elif a>=500:
    print(a+200)
else:
    print(a)