CF158A Next Round

"Contestant who earns a score equal to or greater than the $ k $ -th place finisher's score will advance to the next round, as long as the contestant earns a positive score..." — an excerpt from contest rules. A total of $ n $ participants took part in the contest ( $ n>=k $ ), and you already know their scores. Calculate how many participants will advance to the next round.

The first line of the input contains two integers $ n $ and $ k $ ( $ 1

Output the number of participants who advance to the next round.

In the first example the participant on the 5th place earned 7 points. As the participant on the 6th place also earned 7 points, there are 6 advancers. In the second example nobody got a positive score.