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Cod sursa(job #635979)
#include<cstdio>
#define MOD 9999991
long long n;
void read() {
scanf("%lld",&n); //16796, 58786, 208012, 742900, 2674440, 9694845, 35357670, 129644790, 477638700, 1767263190, 6564120420, 24466267020, 91482563640
}
void rez() {
long long i;
long long cat1=1,cat2;
for (i=1;i<n;i++) {
cat2=( (cat1*2*(2*i+1))/(i+2))%MOD;
cat1=cat2;
}
printf("%lld",cat1);
}
int main() {
freopen("dirichlet.in","r",stdin);
freopen("dirichlet.out","w",stdout);
read();
rez();
return 0;
}