Considering the code below, indicate what must be added in main$()$ to make this compile and run correctly:

#include

using namespace std;

namespace N$1\{$

void myFunc$()\{$

int i;

cout $<<$ "Please enter a number: $"$;

cin $>>$ i;

$\}$

$\}$

namespace N$2\{$

void myFunc$($int n$)\{$

cout $<<$ "You sent me the number $"<<$ n $<<$ endl;

$\}$

$\}$

int main$()\{$

myFunc$(42)$;

return $0$;

$\}$