import std.algorithm, std.conv, std.range, std.stdio, std.string;

void main()
{
  auto n = readln.chomp.to!int;
  auto a = readln.split.to!(long[]);

  auto ma = a[0], mi = a[0];
  foreach (ai; a[1..$]) {
    if (ai > 0) {
      ma = max(ma+ai, ma*ai, ma/ai);
      mi = min(mi-ai, mi*ai, mi/ai);
    } else if (ai < 0) {
      ma = max(ma-ai, mi*ai, mi/ai);
      mi = min(mi+ai, ma*ai, ma/ai);
    } else {
      ma = max(ma, 0);
      mi = min(mi, 0);
    }
  }

  writeln(ma);
}