The package for this problem was not updated by the problem writer or Codeforces administration after we've upgraded the judging servers. To adjust the time limit constraint, a solution execution time will be multiplied by 2. For example, if your solution works for 400 ms on judging servers, then the value 800 ms will be displayed and used to determine the verdict.

Codeforces Round 144 (Div. 2) |
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Finished |

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implementation

math

*800

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A. Perfect Permutation

time limit per test

2 secondsmemory limit per test

256 megabytesinput

standard inputoutput

standard outputA permutation is a sequence of integers *p*_{1}, *p*_{2}, ..., *p*_{n}, consisting of *n* distinct positive integers, each of them doesn't exceed *n*. Let's denote the *i*-th element of permutation *p* as *p*_{i}. We'll call number *n* the size of permutation *p*_{1}, *p*_{2}, ..., *p*_{n}.

Nickolas adores permutations. He likes some permutations more than the others. He calls such permutations perfect. A perfect permutation is such permutation *p* that for any *i* (1 ≤ *i* ≤ *n*) (*n* is the permutation size) the following equations hold *p*_{pi} = *i* and *p*_{i} ≠ *i*. Nickolas asks you to print any perfect permutation of size *n* for the given *n*.

Input

A single line contains a single integer *n* (1 ≤ *n* ≤ 100) — the permutation size.

Output

If a perfect permutation of size *n* doesn't exist, print a single integer -1. Otherwise print *n* distinct integers from 1 to *n*, *p*_{1}, *p*_{2}, ..., *p*_{n} — permutation *p*, that is perfect. Separate printed numbers by whitespaces.

Examples

Input

1

Output

-1

Input

2

Output

2 1

Input

4

Output

2 1 4 3

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