Google Sheets: How do I execute a formula in a column based on the value of a dropdown in another column?

Question

Context: I have an allocation Google Sheet.

1. Row 2 columns H to N:
2. I only want to sum the totals in row 2 columns H to N with/from the data in rows 3-5 columns H-N if Column E for any specific row is "High" or "Very High"
3. So a specific example - J2 would be 0.5 if E5's dropdown was "low"
4. Or, J2 would be 1.0 if E4 and E5 were "high" or "very high"

Thank you in advance!