func_code_string: #include <bits/stdc++.h>   #pragma comment(linker,  /STACK:66777216 )   using namespace std;   int RAND() { return (rand() << 16) + rand(); }   const long long MOD = 1000000007;   const int N = 2000007;   int n;   long long f[N];   long long power(long long a, long long b) {     if (b == 0) return 1;     if (b & 1) return a * power(a, b - 1) % MOD;     long long r = power(a, b >> 1);     return r * r % MOD;   }   long long inv(long long a) { return power(a, MOD - 2); }   long long C(int n, int k) { return f[n] * inv(f[k] * f[n - k] % MOD) % MOD; }   void solve() {     f[0] = 1;     for (int i = 1; i < N; ++i) f[i] = i * f[i - 1] % MOD;     cin >> n;     long long ans = ((n + 2) * C(2 * n + 2, n) - n - 1) % MOD * inv(n + 1) % MOD;     if (ans < 0) ans += MOD;     cout << ans << endl;   }   void testgen() {     FILE* f = fopen( input.txt ,  w );     fclose(f);   }   int main() {     cout << fixed;     cout.precision(16);     cerr << fixed;     cerr.precision(3);     solve();     return 0;   }   