#define _POSIX_SOURCE /* you are not supposed to understand this */
#define O(OOO,OO0,O00,O0O,OO,O0)\0##O0O%:%:OO\0##O0%:%:OOO\0##OO0%:%:O00
#include<signal.h>
static volatile sig_atomic_t One;
#include<stdlib.h>
#include<unistd.h>
#define Zero(NULL)#NULL
in??/
t
#define ONE(One) Zero(One)
??=line 10 ONE(O(1,1,2,6,0,6))
main (register zero, char **ONE)
%:
<% switch (sizeof __FILE__ < zero) case 1: return One /= zero;
{ auto one = zero = atoi (ONE<:zero-1:>);
do for (one += alarm (One |= signal (__LINE__, (void(*)(register))main)
!= SIG_ERR); One; ++one);
while (zero -= write (1, __FILE__+(one&1), 1));
return write (1, 1+__FILE__+1, 1) != 1;
%>}