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Cod sursa(job #636983)
#include <fstream>
using namespace std;
ifstream f("dirichlet.in");
ofstream g("dirichlet.out");
long long n,s=1,nf=1,m=9999991,i;
long long lgpow (long long b,long long p) {
long long x,r;
for (x=b,r=1;p>0;p>>=1) {
if ((p & 1) !=0)
r=r*x % m;
x=x*x%m;
}
return r%m;
}
int main () {
f >> n;
for (i=2;i<=n;i++) {
s=(s+lgpow(i,i-2))%m;
}
g << s << '\n';
f.close();g.close();
return 0;
}