ch-1.raku « raku « gugod « challenge-080 - github/perlweeklychallenge-club.git - Unnamed repository; edit this file 'description' to name the repository.

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#!/usr/bin/env raku

# Usage:
#   raku ./challenge-080/gugod/raku/ch-1.raku 1 2 18 4 5
#   3

my $N = @*ARGS.map({ .Int }).Set();

(1..*).first(-> $n { ! $N{$n} }).say;