N,K=map(int,input().split()) S=input() I=[x+1 for x in range(N)] ANS={} while 1: before=len(S) # print(I) # print(S) # print('########') idx=S.find('()') # S.replace('()','') T=list(S) if not T:break T.pop(idx) if not T:break T.pop(idx) # print(T) S=''.join(T) a=I.pop(idx) b=I.pop(idx) ANS[a]=b ANS[b]=a if before==len(S): break #print(ANS) #print(N,K,S) print(ANS[K])