'Zabbix map note sum

When I creating a map in Zabbix, I can't track the total traffic between two hosts. I have a signature:

Arista2→Raidix2
↓{10.253.0.19:ifHCInOctets.["19"].last(0)} + {10.253.0.19:ifHCInOctets.["20"].last(0)}
{10.253.0.19:ifHCOutOctets.["19"].last(0)} + {10.253.0.19:ifHCOutOctets.["20"].last(0)}↑

Where is the plus sign I need to add these two traffic into one. I looked at the documentation and didn't find anything. I need your help guys. enter image description here



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