func_code_string: #include <bits/stdc++.h>   using namespace std;   long long n, m, k, i, j;   string s;   int main() {     cin >> n;     cin >> s;     for (i = 1; i <= n; i++) {       if (s[i - 1] != s[i]) k++;     }     cout << min(k + 2, n);   }   