Write a program that reads an integer n from input and calculates the sum of all integers from 1 to n (inclusive) using a while loop. Print the result.

Example: If input is 5, output should be 15 (1 + 2 + 3 + 4 + 5 = 15).

Write a program that reads two integers: start and skip. Count down from start to 1, but skip printing the number skip. Print each number on a separate line.

Example: If input is 5 and 2, output should be:

1
5
2
4
3
3
4
1

(skipped 2)

Write a program that reads two integers: num and limit. Print all multiples of num that are less than or equal to limit, each on a separate line, using a for loop with range.

Example: If input is 3 and 10, output should be:

1
3
2
6
3
9

Write a program that reads an integer n from input and calculates n! (n factorial) using a for loop. Remember that 0! = 1 and n! = n × (n-1) × ... × 1 for n > 0. Print the result.

Example: If input is 5, output should be 120 (5! = 5 × 4 × 3 × 2 × 1 = 120).

Write a program that reads an integer n from input and checks if it is a perfect number. A perfect number is a positive integer that equals the sum of its proper divisors (excluding itself). Print “Perfect” if it is a perfect number, otherwise print “Not Perfect”.

Example: 6 is perfect because 1 + 2 + 3 = 6. If input is 6, output should be Perfect.

Write a program that reads a positive integer from input and calculates the sum of its digits using a loop. Print the result.

Example: If input is 123, output should be 6 (1 + 2 + 3 = 6).