Formula to calculate total lost

Hello and good morning. If someone would not mind providing the correct formula for what I'm trying to accomplish, I would be very grateful. Thank you in advance for any help you would be willing to provide. I have three columns, Sales stage, Forecast Amount & Total Lost. I need a formula that will reference the Sales stage column and if the Sales stage is 5 - Lost, calculate all lost totals in the Forecast Amount column and show the amount in the Total Lost column. I appreciate your time and support. Have a great day.


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