Factorial of a Number

 Problem Statement

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Write a program to find the factorial of a number.

Factorial of n is:

n! = n * (n-1) * (n-2) * (n-3)....* 1

Output the factorial of 'n'. If it does not exist, output 'Error'.

Input Format :
The only line of input contains a single integer.
Output Format :
The only line of output prints the Factorial of the number or "Error" if it doesn't exist.
Constraints:
-10 <= n <= 12
Sample Input 1 :
5
Sample Output 1 :
120
Explanation Of Sample Input 1:
5!=5*4*3*2*1=120
Sample Input 2 :
0
Sample Output 2 :
1
Explanation Of Sample Input 2:
Its a fact that 0!=1
Sample Input 3 :
-2
Sample Output 3 :
Error
Explanation Of Sample Input 3:
It's a fact that we can't find the factorial of a negative number.

#Your code goes here

n=int(input())

res=1
if n<0:    
    print("Error")
    
elif n==0:
    print(1)
    
else:
    for i in range(1,n+1):
        res*=i
    print(res)

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