Could someone help solve this molarity problem?

A student weighs 5.678 of KHP and dissolves it in water and places it in a 250 mL Erlenmeyer flask to which 5 drops of the acid-base indicator phenolphthalein is added. This solution is titrated with a sodium hydroxide solution of unknown molarity. 26.64 mL of sodium hydroxide solution is required to reach the endpoint. **Calculate the molarity of the sodium hydroxide solution.**