<?php
$n=10;
$count = 0;
for ($i= 1; $i<=$n; $i++)
for ($j=$i+1; $j<=$n; $j++)
for ($k=$i+1; $k<=$j; $k++)
$count ++;
echo $count;
?>
PD9waHAKJG49MTA7CiRjb3VudCA9IDA7CiBmb3IgKCRpPSAxOyAkaTw9JG47ICRpKyspCiAgICAgIGZvciAoJGo9JGkrMTsgJGo8PSRuOyAkaisrKQogICAgICAgICAgIGZvciAoJGs9JGkrMTsgJGs8PSRqOyAkaysrKQogICAgICAgICAgICAgICAgJGNvdW50ICsrOwogICAgICAgICAgICAgICAgZWNobyAkY291bnQ7CiAgICAgICAgICAgICAgICA/Pg==