import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        int n = sc.nextInt();
        int idx = sc.nextInt();
        char[] values = sc.next().toCharArray();
        ArrayDeque<Integer> stack = new ArrayDeque<>();
        for (int i = 1; i <= n; i++) {
            if (values[i - 1] == '(') {
                stack.push(i);
            } else {
                int current = stack.pop();
                if (current == idx) {
                    System.out.println(i);
                    return;
                } else if (i == idx) {
                    System.out.println(current);
                    return;
                }
            }
        }
    }
}
    
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}