Problem D
Cubes
                                                                Languages
                        
                            
                                                                    en
                                                                    sv
                                                            
                        
                                                                
  
      Input
The input consists of a single integer N on the first and only line, $1 \leq N \leq 100$.
Output
The program should output a single line containing an integer: the number of small cubes Nadja needs.
Scoring
| 
           Group  | 
        
           Points  | 
        
           Constraints  | 
      
| 
           $1$  | 
        
           $20$  | 
        
           $N = 10$  | 
      
| 
           $2$  | 
        
           $80$  | 
        
           No additional constraints.  | 
      
Explanation of Example
In example 1, Nadja wants one cube of each side length from $1$ to $4$. Thus, she needs $1^3 + 2^3 + 3^3 + 4^3 = 100$ small cubes.
| Sample Input 1 | Sample Output 1 | 
|---|---|
          4  | 
        
          100  | 
      
| Sample Input 2 | Sample Output 2 | 
|---|---|
          7  | 
        
          784  | 
      
