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Cod sursa(job #638157)
# include <fstream>
# define mod 9999991
using namespace std;
ifstream f ("dirichlet.in");
ofstream g ("dirichlet.out");
long long int a[1000005],s[1000005],n,i,j;
int main ()
{
f>>n;
a[1]=1;
s[1]=1;
for (i=2;i<=n;i++)
{
a[i]=2*a[i-1];
a[i]=a[i]%mod;
for (j=1;j<=i-2;j++)
{
a[i]+=s[j];
a[i]=a[i]%mod;
}
s[i]=s[i-1]+a[i];
s[i]=s[i]%mod;
}
g<<a[n]%mod;
return 0;
}