func_code_string: #include <bits/stdc++.h>   using namespace std;   long long int pow_mod(long long int a, long long int b) {     long long int res = 1;     while (b != 0) {       if (b & 1) {         res = (res * a) % 1000000007;       }       a = (a * a) % 1000000007;       b /= 2;     }     return res;   }   long long int inv(long long int x) { return pow_mod(x, 1000000007 - 2); }   void solve() {     long long int n;     cin >> n;     long long int x = 2 * n - 1;     long long int y = n;     long long int res1 = 1;     for (long long int i = 0; i < y; i++) res1 = (res1 * (x - i)) % 1000000007;     long long int res2 = 1;     for (long long int i = 1; i <= y; i++) res2 = (res2 * i) % 1000000007;     long long int ans = (res1 * inv(res2)) % 1000000007;     ans *= 2;     ans %= 1000000007;     ans -= n;     ans += 1000000007;     ans %= 1000000007;     cout << ans << endl;   }   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long int t;     t = 1;     while (t--) solve();     return 0;   }   