how to use my dropdown list

hello ,

i have dropdown list witch is "date" in cell A1
in cell C1 i put number witch is "money"

d1:d100 i have "dates"
e1:e100 should get the data from c1

so i use in e1:e100
=IF(a$1=d1,c$1,0)
=IF(a$2=d2,c$1,0)
etc ...

my problem is that i can use it only for 1 date
i want to choose date from my dropdown list put money and then choose another date and put money

sorry about my english .
and thx
moshelog