#!/usr/bin/perl
# yukicoder My Practice
# author: Leonardone @ NEETSDKASU
my $n = $*IN.get;
my @a = $*IN.get.words;
my $mx = 0;
my $ans = 0;
for @a {
my $v = $_.Int;
if $v > $mx {
$mx = $v;
} elsif $ans < $v && $v < $mx {
$ans = $v;
}
}
say $ans;
IyEvdXNyL2Jpbi9wZXJsCiMgeXVraWNvZGVyIE15IFByYWN0aWNlCiMgYXV0aG9yOiBMZW9uYXJkb25lIEAgTkVFVFNES0FTVQoKbXkgJG4gPSAkKklOLmdldDsKbXkgQGEgPSAkKklOLmdldC53b3JkczsKbXkgJG14ID0gMDsKbXkgJGFucyA9IDA7Cgpmb3IgQGEgewoJbXkgJHYgPSAkXy5JbnQ7CglpZiAkdiA+ICRteCB7CgkJJG14ID0gJHY7Cgl9IGVsc2lmICRhbnMgPCAkdiAmJiAkdiA8ICRteCB7CgkJJGFucyA9ICR2OwoJfQp9CgpzYXkgJGFuczs=