Finding the lengths of tubes from obtained frequencies

Bmci325

1. The problem statement, all variables and given/known data
I have four frequencies and need to know how long to cut tubes to make that frequency so when i blow over them they play mary had a little lamb


2. Relevant equations
v=f(lamda)
440(2^n/12)

3. The attempt at a solution

Frequencies 523.2511,440, 391.9954,349.2282
What do i do from there?