def main():
    N, K = map(int, input().split())
    S = input()

    stack = []
    for idx, bracket in enumerate(S, 1):
        match bracket:
            case "(":
                stack.append(idx)
            case ")":
                another = stack.pop()
                if idx == K:
                    print(another)
                if another == K:
                    print(idx)


if __name__ == "__main__":
    main()