#### Question:-

Nila uses pencils to write at school and at home. When she was in her 1st standard, her parents bought her one pencil. In her 2nd standard, she needed 5 pencils, and in 3rd standard, she needed 14 pencils and so on. How many pencils does she get from the provided standard?

**Note : If the input given is not between 1 to 12 then the output should be “Invalid Standard”**

**Sample Input 1:**

Enter the standard: 4**Sample Output 1:**

Nila gets 30 pencils

**Sample Input 2:**

Enter the standard: 5**Sample Output 2:**

Nila gets 55 pencils

**Sample Input 3:**

Enter the standard:14**Sample Output 3:**

Invalid Standard

##### Code:-

import java.util.*; class Count{ public static void main(String args[]){ Scanner sc = new Scanner(System.in); int n, count=0; System.out.println("Enter the standard: "); n= sc.nextInt(); if(n<1 || n>12){ System.out.println("Invalid Standard"); } else{ count = (n*(n+1)*(2*n+1))/6; System.out.println("Nila gets "+count+" pencils"); } } }