import sys
sys.setrecursionlimit(5000000)

def Ack(M, N):
    if (not M):
        return( N + 1 )
    if (not N):
        return( Ack(M-1, 1) )
    return( Ack(M-1, Ack(M, N-1)) )

def main():
    NUM = 9
    sys.setrecursionlimit(10000)
    Ack(3, NUM)

main()

<div id='cgit'><table id='header'>
<tr>
<td class='logo' rowspan='2'><a href='/'><img src='/cgit-css/ruby.png' alt='cgit logo'/></a></td>
<td class='main'><a href='/'>index</a> : <a title='ruby.git' href='/ruby.git/'>ruby.git</a></td><td class='form'><form method='get'>
<input type='hidden' name='id' value='24ae0e8ed73947e030b31badb9d620ddf71898b6'/><select name='h' onchange='this.form.submit();'>
<option value='master'>master</option>
<option value='ruby_1_3'>ruby_1_3</option>
<option value='ruby_1_4'>ruby_1_4</option>
<option value='ruby_1_6'>ruby_1_6</option>
<option value='ruby_1_8'>ruby_1_8</option>
<option value='ruby_1_8_5'>ruby_1_8_5</option>
<option value='ruby_1_8_6'>ruby_1_8_6</option>
<option value='ruby_1_8_7'>ruby_1_8_7</option>
<option value='ruby_1_9_1'>ruby_1_9_1</option>
<option value='ruby_1_9_2'>ruby_1_9_2</option>
<option value='ruby_1_9_3'>ruby_1_9_3</option>
<option value='ruby_2_0_0'>ruby_2_0_0</option>
<option value='ruby_2_1'>ruby_2_1</option>
<option value='ruby_2_2'>ruby_2_2</option>
<option value='ruby_2_3'>ruby_2_3</option>
<option value='ruby_2_4'>ruby_2_4</option>
<option value='ruby_2_5'>ruby_2_5</option>
<option value='ruby_2_6'>ruby_2_6</option>
<option value='ruby_2_7'>ruby_2_7</option>
<option value='ruby_3_0'>ruby_3_0</option>
<option value='ruby_3_1'>ruby_3_1</option>
<option value='ruby_3_2'>ruby_3_2</option>
<option value='ruby_3_3'>ruby_3_3</option>
<option value='v1_0r'>v1_0r</option>
<option value='v1_1dev'>v1_1dev</option>
<option value='v1_1r'>v1_1r</option>
</select> <input type='submit' value='switch'/></form></td></tr>
<tr><td class='sub'>The Ruby Programming Language</td><td class='sub right'></td></tr></table>
<table class='tabs'><tr><td>
<a href='/ruby.git/?h=v1_8_6_229'>summary</a><a href='/ruby.git/refs/?h=v1_8_6_229&amp;id=24ae0e8ed73947e030b31badb9d620ddf71898b6'>refs</a><a class='active' href='/ruby.git/log/rubystub.c?h=v1_8_6_229'>log</a><a href='/ruby.git/tree/rubystub.c?h=v1_8_6_229&amp;id=24ae0e8ed73947e030b31badb9d620ddf71898b6'>tree</a><a href='/ruby.git/commit/rubystub.c?h=v1_8_6_229&amp;id=24ae0e8ed73947e030b31badb9d620ddf71898b6'>commit</a><a href='/ruby.git/diff/rubystub.c?h=v1_8_6_229&amp;id=24ae0e8ed73947e030b31badb9d620ddf71898b6'>diff</a></td><td class='form'><form class='right' method='get' action='/ruby.git/log/rubystub.c'>
<input type='hidden' name='h' value='v1_8_6_229'/><input type='hidden' name='id' value='24ae0e8ed73947e030b31badb9d620ddf71898b6'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/ruby.git/log/?h=v1_8_6_229&amp;id=24ae0e8ed73947e030b31badb9d620ddf71898b6'>root</a>/<a href='/ruby.git/log/rubystub.c?h=v1_8_6_229&amp;id=24ae0e8ed73947e030b31badb9d620ddf71898b6'>rubystub.c</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/ruby.git/log/rubystub.c?h=v1_8_6_229&amp;id=24ae0e8ed73947e030b31badb9d620ddf71898b6&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2016-08-20 05:58:58 +0000'>2016-08-20</span></td><td><a href='/ruby.git/commit/rubystub.c?h=v1_8_6_229&amp;id=33ae176ba72999807e3eb311c9d9418792e47502'>rubystub.c: sys/param.h for MAXPATHLEN</a></td><td>nobu</td></tr>
<tr><td><span title='2016-08-20 02:20:34 +0000'>2016-08-20</span></td><td><a href='/ruby.git/commit/rubystub.c?h=v1_8_6_229&amp;id=9b454bfaf3a3c37fd8ff83880fc88f3dc9375a8d'>rubystub</a></td><td>nobu</td></tr>