#include <iostream>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <queue>
#include <deque>
#include <set>
#include <map>
#include <tuple>
#include <cmath>
#include <numeric>
#include <functional>
#include <cassert>

#define debug_value(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << #x << "=" << x << endl;
#define debug(x) cerr << "line" << __LINE__ << ":<" << __func__ << ">:" << x << endl;

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }

using namespace std;
typedef long long ll;

template<typename T>
vector<vector<T>> vec2d(int n, int m, T v){
    return vector<vector<T>>(n, vector<T>(m, v));
}

template<typename T>
vector<vector<vector<T>>> vec3d(int n, int m, int k, T v){
    return vector<vector<vector<T>>>(n, vector<vector<T>>(m, vector<T>(k, v)));
}

template<typename T>
void print_vector(vector<T> v, char delimiter=' '){
    if(v.empty()) {
        cout << endl;
        return;
    }
    for(int i = 0; i+1 < v.size(); i++) cout << v[i] << delimiter;
    cout << v.back() << endl;
}

template <typename T>
struct bit{
    int n;
    vector<T> data;

    bit(int n_){
        n = 1;
        while(n < n_) n *= 2;
        data = vector<T>(n+1);
        for(int i = 0; i <= n; i++) data[i] = 0;
    }
    
    T sum(int i){
        T ret = 0;
        while(i > 0){
            ret += data[i];
            i -= i&-i;
        }
        return ret;
    }

    void add(int i, T x){
        while(i <= n){
            data[i] += x;
            i += i&-i;
        }
    }
};

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout << setprecision(10) << fixed;
    int n, q; cin >> n >> q;
    string s; cin >> s;
    bit<int> bt(n-1);
    for(int i = 1; i < n; i++){
        if(s[i] != s[i-1]){
            bt.add(i, 1);
        }
    }
    auto modify = [&](int i){
        assert(i != 0);
        if(s[i-1] != s[i]){
            bt.add(i, -1);
        }else{
            bt.add(i, 1);
        }
    };
    auto change = [&](int i){
        if(i >= 1){
            modify(i);
        }
        if(i+1 < n){
            modify(i+1);
        }
        if(s[i] == '(') s[i] = ')';
        else s[i] = '(';
    };
    while(q--){
        int t; cin >> t;
        if(t == 1){
            int i; cin >> i; i--;
            change(i);
        }else{
            int l, r; cin >> l >> r; l--; r--;
            int x = s[l] == '(' ? 0 : -1;
            x += s[r] == ')' ? 1 : 0;
            x += bt.sum(r)-bt.sum(l);
            // cout << s.substr(l, r-l+1) << endl;
            cout << max(x, 0)/2 << endl;
        }
    }
}