Maximum Expression Value

In this problem, you are given a positive integer ( n ). Your task is to compute the maximum possible value of an expression defined as follows:

• If ( n = 1 ), the value is 1.
• Otherwise, for ( n \ge 2 ), the value is

[ 1 + \prod_{i=2}^{n} i = 1 + (2 \times 3 \times \cdots \times n)]

For example, when ( n = 3 ), the expression becomes (1 + (2 \times 3) = 7) and when ( n = 4 ), the answer is (1 + (2 \times 3 \times 4) = 25). Read the input from standard input and print the result to standard output.

inputFormat

A single integer ( n ) (where ( n \ge 1 )) is provided as input on a single line.

outputFormat

Output the maximum value of the expression as defined. The output should be printed on a single line to standard output.## sample

1

1