f(0)=0
f(1/10)=1/100
f(2/10)=f(1/5)=1/25
f(3/10)=9/100
f(4/10)=f(2/5)=4/25
f(5/10)=f(1/2)=1/4
f(6/10)=f(3/5)=9/25
f(7/10)=49/100
f(8/10)=f(4/5)=16/25
f(9/10)=81/100
f(1)=1
hehe,..
f(0)=0
f(1/10)=1/100
f(2/10)=f(1/5)=1/25
f(3/10)=9/100
f(4/10)=f(2/5)=4/25
f(5/10)=f(1/2)=1/4
f(6/10)=f(3/5)=9/25
f(7/10)=49/100
f(8/10)=f(4/5)=16/25
f(9/10)=81/100
f(1)=1
hehe,..