#include <cstdio> #include <iostream> #include <sstream> #include <fstream> #include <iomanip> #include <algorithm> #include <cmath> #include <string> #include <vector> #include <list> #include <queue> #include <stack> #include <set> #include <map> #include <bitset> #include <numeric> #include <limits> #include <climits> #include <cfloat> #include <functional> using namespace std; int main() { int n, k; string s; cin >> n >> k >> s; vector<int> v(n); stack<int> stk; for(int i=0; i<n; ++i){ if(s[i] == '('){ stk.push(i); } else{ int j = stk.top(); stk.pop(); v[i] = j; v[j] = i; } } cout << (v[k-1] + 1) << endl; return 0; }