$3\mathrm{.}1$hthal

memory limit per test: $256$ megabytes input: standard input

output: standard output

Complete the following function:

$//$ print$\_$triangle$($n$)$ prints a triangle of alternating slashes $(/$ and $/)$

II of height and width $n$

I$/$ requires: $n1$

void print$\_$triangle $($int $n)$:

Use the following main function exactly:

int main$($void$)$ &

int $n=$ :

scanf$(\%d,8n)$;

print$\_$triangle $(n)$ :

$3$

Examples

input

$3$

output

input

output