2017 Winter Waterloo Local ACM Contest, Problem A
Vera owns tops and
pants. The
-th top and
-th pants have colour
, for
, where all
colours are different from each other.
An outfit consists of one top and one pants. Vera likes outfits where the top and pants are not the same colour.
How many different outfits does she like?
Constraints
is integer
Input Specification
The input will be in the format:
Output Specification
Output one line with the number of different outfits Vera likes.
Sample Input 1
1
Sample Output 1
0
Sample Input 2
2
Sample Output 2
2
Sample Input 3
5
Sample Output 3
20
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