$"$#include

using namespace std;

int main$()\{$

int stop;

int result;

int a;

int b;

cin $>>$ stop;

result $=0$;

for $($a $=1$; a $<3$; $++$a$)\{$

cout $<<$ a $<<"$: $"$;

for $($b $=0$; b $<4$; $++$b$)\{$

result $+=$ a;

if $($result $>$ stop$)\{$

cout $<<"\_"$;

continue;

$\}$

cout $<<$ result $<<","$;

$\}$

cout $<<$ endl;

$\}$

return $0$;

$\}"$ can you break down how this code works so I can understand it$?$