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Cod sursa(job #657875)
#include <fstream>
using namespace std;
int main()
{
long long v[7],sol,h;
int n,k,i,c,r;
ifstream cin("kperm.in");
ofstream cout("kperm.out");
cin>>n>>k;
if (k%2==0)
{
cout<<0<<"\n";
return 0;
}
c=n/k;
r=n%k;
h=666013;
v[1]=v[2]=v[3]=v[4]=v[5]=1;
for (i=2;i<=r;++i)
v[1]=(v[1]*i)%h;
for (i=2;i<=k-r;++i)
v[2]=(v[2]*i)%h;
for (i=2;i<=c;++i)
v[3]=(v[3]*i)%h;
for (i=1;i<=k-r;++i)
v[4]=(v[4]*v[3])%h;
v[3]=(v[3]*(c+1))%h;
for (i=1;i<=r;++i)
v[5]=(v[5]*v[3])%h;
sol=(v[1]*v[2])%h;
sol=(sol*v[4])%h;
sol=(sol*v[5])%h;
cout<<sol<<"\n";
cin.close();
cout.close();
return 0;
}