func_code_string: #include <bits/stdc++.h>   using namespace std;   const int MAXN = 112345;   long long l[MAXN], r[MAXN];   int main() {     int n;     cin >> n;     for (int i = 0; i < n; ++i) scanf( %lld %lld , l + i, r + i);     sort(l, l + n);     sort(r, r + n);     long long ans = n;     for (int i = 0; i < n; ++i) ans += max(l[i], r[i]);     cout << ans << endl;     return 0;   }   