func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = (int)(1e5) + 5;   int l[maxn], r[maxn];   int main() {     ios::sync_with_stdio(false);     int n;     cin >> n;     for (int i = 1; i <= n; ++i) cin >> l[i] >> r[i];     sort(l + 1, l + n + 1);     sort(r + 1, r + n + 1);     long long ret = n;     for (int i = 1; i <= n; ++i) ret += max(l[i], r[i]);     cout << ret << endl;     return 0;   }   