Hello. I'm trying to have one cell look at two other cells to determine its entry.

This what I'm stuck on:

=If(E4=1 and E7=1, 60, if(E4=1 and E7=2, 50, if(E4=1 and E7=3, 40, if(E4=2 and E7=1, 30, if(E4=2 and E7=2, 20, if(E4=2 and E7=3, 10, if(E4=3 and E7=1, 15, if(E4=3 and E7=2, 10, if(E4=3 and E7=3, 5, 0)))))))))

Can anyone please help me?