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diff --git a/challenge-049/cristian-heredia/perl/ch-1.pl b/challenge-049/cristian-heredia/perl/ch-1.pl
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+++ b/challenge-049/cristian-heredia/perl/ch-1.pl
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+use strict;
+use warnings;
+no warnings 'recursion';
+
+#Smallest Multiple
+#Write a script to accept a positive number as command line argument and print the smallest multiple of the given number consists of digits 0 and 1.
+
+#For example:
+
+#For given number 55, the smallest multiple is 110 consisting of digits 0 and 1.
+my $number;
+my $result;
+my $multiple = 2;
+
+requestNumber();
+sub requestNumber {
+    print "Enter a positive number:\n"; 
+    $number = <STDIN>;
+    checkNumber();
+}
+
+sub checkNumber {
+    if ( $number =~ /^\+?\d+$/ ) { 
+        smallestMultiple();
+    } else { 
+        requestNumber();
+    }
+} 
+
+sub smallestMultiple {
+    $result = $number * $multiple;
+    checkValues();
+}
+
+sub checkValues {
+   if ( $result =~ /^[01]+$/ ) {
+		$number=~ s/^\s+|\s+$//g; 
+		print "The smallest multiple is $result\n$number * $multiple = $result\n";
+   }
+   else {
+       $multiple++;
+       smallestMultiple();
+   }
+}