Conditional formatting based on values in A1:A6

Hello -

I have a spreadsheet where A1 thru A6 have values of R,Y,G,N/A

Example:
A1 = R
A2 = Y
A3 = G
A4 = Y
A5 = G
A5 = Y



I want to create a formula that will automatically update B1 based on the following criteria:
If there are 2 or more Y, then B1 will be Y
If there are 2 or more R, then B1 will be R
otherwise B1 will be G

If have messed around with COUNTIF, but have had no luck. Is there an easy way to put this into a formula?

thanks in advance for all the help.