Hmmm, i wrote pro gram (it was simply), abd there is werd results (i mean in example). Just think about it..
for input 2 2 answer 2
for input 2 3 answer 3
for input 2 4 answer 5
for input 2 5 answer 8
for input 2 6 answer 13
for input 2 7 answer 21
for input 2 8 answer 34
for input 2 9 answer 55
for input 2 10 answer 89

as we can notice it's Fibbonacio numbers. but in example they gave for input 2 10 answer is 90... i check answers fo 2 2 ,; 2 3 ; 2 4; 2 5; (i drow all that numers and check how many is valid) and answers i have are ok... I just want to ask.. I'm so stupid (and i miss something) or it's judge problem?

OMG! i was soooooo stupid! I have problems becouse i suppose that first numer is K-base system, and secound is number of digital! (i notice that first IS number of digits, and sercound system) OK THS all for help :P