import std.stdio,
       std.conv,
       std.string,
       std.range,
       std.math,
       std.bigint,
       std.algorithm,
       core.bitop;

void main()
{
    auto N = readln.strip.to!int;
    auto A = stdin.byLineCopy.array;

    (A.sort().group.map!"a[1]".reduce!max <= (N + 1) / 2 ? "YES" : "NO").writeln;
}