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Cod sursa(job #635310)
#include<cstdio>
#define MOD 9999991
void read(),solve(),back(int,int);
long long C[1000010];
int i,n;
int main()
{
read();
solve();
return 0;
}
void read()
{
freopen("dirichlet.in","r",stdin);
freopen("dirichlet.out","w",stdout);
scanf("%d",&n);
}
void solve()
{
C[1]=1;
if(n==1)printf("1\n");
for(i=1;i<n;i++)
{
C[i+1]=((4*i+2)*C[i])/(i+2);
C[i+1]%=MOD;
}
printf("%lld\n",C[n]);
}