[R] error with barplot command?

[=?GB2312?B?u8bI2bnz?=]

when i use barplot ,it seems there is sth wrong with it.
my command are:
> beer = scan()
1: 3 4 1 1 3 4 3 3 1 3 2 1 2 1 2 3 2 3 1 1 1 1 4 3 1
26:
Read 25 items
> barplot(table(beer))

but it does NOT produce what i want.

> version
         _              
platform i386-pc-mingw32
arch     i386           
os       mingw32        
system   i386, mingw32  
status                  
major    1              
minor    9.0            
year     2004           
month    04             
day      12             
language R    

btw:i get what i want in R1.8.1pat