#include <iostream>
#include <string>
#include <atcoder/fenwicktree>
using namespace std;
using namespace atcoder;

int main() {
    int n, q;
    cin >> n >> q;
    string s;
    cin >> s;
    fenwick_tree<int> ft(n - 1);
    for (int i = 0; i < n - 1; ++i) {
        if (s[i] == '(' && s[i + 1] == ')') {
            ft.add(i, 1);
        }
    }
    for (int qi = 0; qi < q; ++qi) {
        int type;
        cin >> type;
        if (type == 1) {
            int i;
            cin >> i;
            --i;
            if (/*i != 0 && */s[i - 1] == '(' && s[i] == ')') {
                ft.add(i - 1, -1);
            }
            if (/*i != n - 1 && */s[i] == '(' && s[i + 1] == ')') {
                ft.add(i, -1);
            }
            if (s[i] == '(') {
                s[i] = ')';
            } else {
                s[i] = '(';
            }
            if (/*i != 0 && */s[i - 1] == '(' && s[i] == ')') {
                ft.add(i - 1, 1);
            }
            if (/*i != n - 1 && */s[i] == '(' && s[i + 1] == ')') {
                ft.add(i, 1);
            }
        } else {
            int l, r;
            cin >> l >> r;
            --l;
            cout << ft.sum(l, r - 1) << '\n';
        }
    }
}