#!/usr/bin/perl -w
print $_ = ($ARGV[0] && $ARGV[0] =~ /\d+/) ? 2 * 3.141592654 * $ARGV[0] : 'please give me a number.', "\n";
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#!/usr/bin/perl -w
print $_ = ($ARGV[0] && $ARGV[0] =~ /\d+/) ? 2 * 3.141592654 * $ARGV[0] : 'please give me a number.', "\n";
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