use strict;
my $input_file = 'foobar.txt';
open my $in, $input_file or die "Failed to read $input_file: $!\n";

my @max = do { local $_ = <$in>; chomp; [ split ] };
my $last = $max[ 0 ][ 1 ];
while ( <$in> ) {
  chomp;
  my ( $x, $y ) = split;
  if ( $y > $last ) {
    $max[ -1 ] = [ $x, $y ];
  }
  elsif ( $max[ -1 ] ) {
    $max[ @max ] = undef;
  }
  $last = $y;
}
close $in;

pop @max unless $max[ -1 ];

print "Maxima:\n";
print "($_->[ 0 ], $_->[ 1 ])\n" for @max;