yeh dil maange more...

Last night i came across a problem.Can u plz help me out???

f(N)=if we keep on summing d digits of a no N, we'll get a single digit.E.g.1234567=1+2+3+4+5+6+7=28(2+8)=10(1+0)=1....so, (1234567)= 1....Yesterday,my friend came to me and asked the remainder when 32 raised to power 32 raised to power 32 is divided by 7.Since i am a quantomaniac, So,i kept thinking about f(32raised to power 32 raised to power 32)....Can u plz ans ds??????