n = gets.to_i * 2
ok = 0
ng = 2000000000
while ng - ok > 1
    mid = (ok + ng) / 2
    if mid * (mid + 1) <= n
        ok = mid
    else 
        ng = mid
    end
end

if ok * (ok + 1) == n
    puts "YES"
    p ok
else
    puts "NO"
end