Problem F
Fimmtudagstilboð
                                                                Languages
                        
                            
                                                                    en
                                                                    is
                                                            
                        
                                                                
  
      
    Hafliði has been a regular at Mahjong Pizza’s Thursday-offer since its debut in 1993. The offer consists of a single pizza with two toppings for $1\, 000$ ISK, that is until January 2021 when it increased by $100$ ISK and has done so every year since. Hafliði wants you to write a program that tells him how much the offer costs in the year $y$ given this pattern.
Input
First and only line contains a single integer $y$.
Output
Write a single line containing the price of a Thursday-offer in the year $y$.
Scoring
| 
           Group  | 
        
           Points  | 
        
           Constraints  | 
      
| 
           1  | 
        
           20  | 
        
           $y = 2\, 020$  | 
      
| 
           2  | 
        
           20  | 
        
           $2\, 020 \leq y \leq 2\, 024$  | 
      
| 
           3  | 
        
           30  | 
        
           $2\, 020 \leq y \leq 9\, 999$  | 
      
| 
           4  | 
        
           30  | 
        
           $1\, 993 \leq y \leq 9\, 999$  | 
      
| Sample Input 1 | Sample Output 1 | 
|---|---|
          2020  | 
        
          1000  | 
      
| Sample Input 2 | Sample Output 2 | 
|---|---|
          2024  | 
        
          1400  | 
      
