loading balanceand download from wan and upload from another

I have 5 internet lines I need make the download from: wan2,wan3,wan4 and wan5 with loading balance to all lines.

and make the upload from wan1 just.

How I can mix between to concept :1-loading balance and 2-download from wan and upload from another

look to this link

http://wiki.mikrotik.com/wiki/Upload_wan_download_another

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