Function Filter with 2 arguments

Hello everyone,

I have a data table like this one : 

I want to do a 3 lines chart to compare

- Sessions

- Session with a filter medium = organic

=>Organic Sessions = CALCULATE(SUM('MyDataSet'[Sessions]);FILTER('MyDataSet';'MyDataSet'[Medium]="organic"))

- Sessions with a filter medium = organic AND Page path level 1 = "/coloration"

I dont know how to write the last formula. 

Could someone help me please ? 

Thanks !! 

Visar