#include <iostream>
#include <vector>
#include <cmath>
#include <map>
#include <set>
#include <iomanip>
#include <queue>
#include <algorithm>
#include <numeric>
#include <deque>
#include <complex>

using namespace std;
using ll = long long;

//RSQ (0-indexed)
template<class T> struct BIT {
    vector<T> bit;
    int N;

    BIT (int n){
        N = n;
        bit.resize(N);
    }

    void add(int loc, T val){
        loc++;
        while(loc <= N){
            bit[loc-1] += val;
            loc += loc & -loc;
        }
    }

    T sum(int l, int r){
        T res = _sum(r) - _sum(l-1);
        return res;
    }

    T _sum(int r){
        r++;
        T res = 0;
        while(r > 0){
            res += bit[r-1];
            r -= r & -r;
        }
        return res;
    }
};

int main(){
 
    int N, Q, l, r, t;
    string S;
    cin >> N >> Q >> S;
    BIT<int> tree(N-1);
    for (int i=0; i<N-1; i++){
        if (S[i] == '(' && S[i+1] == ')') tree.add(i, 1);
    }

    for (int i=0; i<Q; i++){
        cin >> t;
        if (t == 1){
            cin >> l; l--;
            if (l-1>=0 && S[l-1] == '(' && S[l] == ')') tree.add(l-1, -1);
            else if (l-1>=0 && S[l-1] == '(' && S[l] == '(') tree.add(l-1, 1);
            if (l+1<=N-1 && S[l] == '(' && S[l+1] == ')') tree.add(l, -1);
            else if (l+1<=N-1 && S[l] == ')' && S[l+1] == ')') tree.add(l, 1);
            S[l] = '('+')'-S[l];
        }
        else{
            cin >> l >> r;
            l--; r--;
            cout << tree.sum(l, r-1) << endl;
        }
    }


    return 0;
}