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A while loop can be used to calculate the sum of integers from 1 to n.

n = int(input())
sum = 0
i = 1
while i <= n:
  sum += i
  i += 1
print(sum)

Here sum += i is shorthand notation for sum = sum + i, adding the current value to the total sum. Similarly, i += 1 is the same as i = i + 1 and increments i with 1.

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Factorial
Hint
Beginner

Input an integer n. Compute and print the factorial of n.

Hint: the factorial of n is the product of all positive integers up to n. For example, if n is 5, the factorial is 5 * 4 * 3 * 2 * 1 = 120.

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