How can I use if statement in R with multi condition?

I'm new to r and I have a question about if() statements.

My data looks like:

Var1  Var2
4     2
6     2
5     1
3     3
2     1

I want to create a new variable called Var3. Something like

if Var2 = 1 then do; Var3 = Var1*30; end; else;
if Var2 = 2 then do; Var3 = Var1*4; end; else;
if Var2 = 3 then do; Var3 = Var1*1; end; else;

Any help to create the code will be appreciated.