h1. Problemele 1-3 pentru pregatirea LOT-ului
 
"Inapoi la pagina":jboi-2007

h2. Buy One Get One Free

Farmer John has discovered the Internet is buying bales of hay
online when he notices a special deal. For every bale of hay of
size A (1 <= A <= 1,000,000) he buys, he can get a bale of hay of

h2. Qualified Primes

Just 13 in this range contains a '3'.

h2. Lilypad Pond

Farmer John has installed a beautiful pond for his cows' esthetic
enjoyment and exercise. The rectangular pond has been partitioned
into square cells of M rows and N columns (1 <= M <= 30; 1 <= N <=