Virtual contest is a way to take part in past contest, as close as possible to participation on time. It is supported only ACM-ICPC mode for virtual contests.
If you've seen these problems, a virtual contest is not for you - solve these problems in the archive.
If you just want to solve some problem from a contest, a virtual contest is not for you - solve this problem in the archive.
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This round has an unusual addition to the rules. For each problem you must use distinct language. Thus, if you have a submission that has passed at least one test or is being tested at the moment, then for this task you can use only this language and can not use it for other tasks. More details can be read by the link. Different implementations of the same language are considered to be the same language (for example, in C++ you can only solve one problem, regardless of the exact chosen compiler).

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C. Maximum Number

time limit per test

1 secondmemory limit per test

256 megabytesinput

standard inputoutput

standard outputStepan has the newest electronic device with a display. Different digits can be shown on it. Each digit is shown on a seven-section indicator like it is shown on the picture below.

So, for example, to show the digit 3 on the display, 5 sections must be highlighted; and for the digit 6, 6 sections must be highlighted.

The battery of the newest device allows to highlight at most *n* sections on the display.

Stepan wants to know the maximum possible integer number which can be shown on the display of his newest device. Your task is to determine this number. Note that this number must not contain leading zeros. Assume that the size of the display is enough to show any integer.

Input

The first line contains the integer *n* (2 ≤ *n* ≤ 100 000) — the maximum number of sections which can be highlighted on the display.

Output

Print the maximum integer which can be shown on the display of Stepan's newest device.

Examples

Input

2

Output

1

Input

3

Output

7

Codeforces (c) Copyright 2010-2019 Mike Mirzayanov

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