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Cod sursa(job #641342)
#include <fstream>
#define prim 9999991
using namespace std;
ifstream f("dirichlet.in");
ofstream g("dirichlet.out");
inline int inm(int x, int p) {
if (p == 1)
return x;
int ans = inm(x, p >> 1);
ans = (1LL * ans * ans) % prim;
if (p & 1)
ans = (1LL * ans * x) % prim;
return ans;
}
int main() {
int n;
f >> n;
int f[2000010]; f[0] = 1;
for (int i = 1; i <= 2 * n; i++)
f[i] = (1LL * i * f[i - 1]) % prim;
int v1 = inm(f[n], prim - 2);
int v2 = inm(f[n + 1], prim - 2);
int val = (1LL * v1 * v2) % prim;
g << (1LL * f[2 * n] * val) % prim << "\n";
return 0;
}