I'm getting wrong answer c

You are given a number NN. Find the sum of all numbers from 11 to NN.

Input:

  • First-line will contain the number NN.

Output:

Print the answer in a single line.

Constraints

  • 1≤N≤1091≤N≤109

Sample Input 1:

4

Sample Output 1:

10

n=int(input())
abil=int((n*(n+1))/2)
print(abil)