Sum or Product

-
 Level EASY

Write a program that asks the user for a number N and a choice C. And then give them the possibility to choose between computing the sum and computing the product of all integers in the range 1 to N (both inclusive).

If C is equal to -

 1, then print the sum
 2, then print the product
 Any other number, then print '-1' (without the quotes)
Input format :
Line 1 : Integer N
Line 2 : Choice C
Output Format :
 Sum or product according to user's choice
Constraints :
1 <= N <= 12
Sample Input 1 :
10
1
Sample Output 1 :
55
Sample Input 2 :
10
2
Sample Output 2 :
3628800
Sample Input 3 :
10
4
Sample Output 3 :
-1
















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