#include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define aLL(g) (g).begin(),(g).end() #define REP(i, x, n) for(int i = x; i < n; i++) #define rep(i,n) REP(i,0,n) #define F(i,j,k) fill(i[0],i[0]+j*j,k) #define P(p) cout<<(p)< vi; typedef vector vl; typedef vector vd; typedef pair pii; typedef pair pll; typedef long long ll; int dx[] = {0,1,0,-1}; int dy[] = {-1,0,1,0}; int sttoi(std::string str){int ret;std::stringstream ss;ss << str;ss >> ret;return ret;} int main(){ int n,k; cin >> n >> k; k--; string s; cin >> s; stack up; int de = 0; if(s[k] == ')'){ for(int i = 0;i < s.length();i++){ if(s[i] == '('){ up.push(i); }else{ if(i == k){ P(up.top()); break; } up.pop(); } } }else{ for(int i = 0;i < s.length();i++){ if(s[i] == '('){ up.push(i); }else{ if(up.top() == k){ P(i+1); break; } up.pop(); } } } }