15. Product of Sums
You are given a number n. Calculate 1∗(1+2)∗(1+2+3)∗...∗(1+2+...+n).
Input
The first line contains a natural number.
Output
Single line containing the solution to the problem.
Sample input 1
1
Sample output 1
1
Sample input 2
2
Sample output 2
3
Sample input 3
3
Sample output 3
18
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