Problem:
Score : 100 points

Problem Statement

Compute A \times B.

Constraints

1 \leq A \leq 100

1 \leq B \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the value A \times B as an integer.

Sample Input 1

2 5

Sample Output 1

10

We have 2 \times 5 = 10.

Sample Input 2

100 100

Sample Output 2

10000

Solution in PHP (7.4.4) (judge verdict: Wrong Answer)

<?php
    $num = intval(trim(fgets(STDIN)));
    if($num ==1){
        echo "0\n";
        exit;
    }
    $standard = $num;
    
    $soinsu = array();
    for($j=2;$j<=sqrt($standard);$j++){
        $soinsu[$j] = 0;
    }
    start:
    for($i=2;$i<=sqrt($standard);$i++){
        if($num%$i ==0){
            // echo $num." ".$i."\n";
            $num = $num/$i;
            $soinsu[$i]++;
            goto start;
        }    
    }
    $count=0;
    $k=1;
    $h=2;
    $last_key = array_key_last((array)$soinsu);
    //素因数の個数を記録した配列に対して１，２，３，４，５と引く数を増やしていきマイナスになる
    for($h=2;$h<=$last_key;$h++){
        while($soinsu[$h]>0){
            // echo $soinsu[$h]."\n";
            $soinsu[$h] = $soinsu[$h] - $k;
            $k++;
            $count++;
        }
    }
    if($count==0){
        echo "1\n";
    }else{
        echo $count."\n";
    }
?>