Uh huh, it was the Manfreds
The title is a line from the song "5, 4, 3, 2, 1" by Manfred Mann, so that gives you the numbers you want.
Now you have to calculate the following:
5+4/3-2x1 = 1
Just go across from left to right with a calculator - I have done the first one as an example. You only want the ones that give nice whole numbers as an answer.