# use strict;
# use warnings;

chomp(my $N=<>);
my $m = 0;
if ($N ne '1') {
    chomp(my $x=<>);
    my @y = split(/ /, $x);
    my %z = map({$_ => undef} @y);
    my @Xs = sort({$a <=> $b} keys(%z));
    if (scalar(@Xs) > 1) {
        $m = 'Inf';
        my $p = shift(@Xs);
        foreach (@Xs) {
            my $d = $_ - $p;
            $m = $d if $d < $m;
            $p = $_;
        }
    }
}
print($m, "\n");