Evaluate the primorial of a number The primorial of a number is the product of all the primes until that number, itself included.

Take a number from STDIN as the input and evaluate its primorial, also known as the prime factorial.

Don't use libraries. Shortest code wins.

Test cases:

1 1
2 2
3 6
4 6
5 30
6 30
7 210
8 210
9 210
10 210
11 2310
12 2310
13 30030
14 30030
15 30030
16 30030
17 510510
18 510510
19 9699690
J, 13 characters
*/p:i._1 p:1+

Examples:
   */p:i._1 p:1+7
210

   */p:i._1 p:1+12
2310