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#include <fstream>
#define DIM 5011
#define MOD 2000003
using namespace std;
ifstream f("sandokan.in");
ofstream g("sandokan.out");
int n,k,poz;
int C[DIM];
int main(void){
register int i,j;
f>>n>>k;
poz=n%(k-1);
if(poz==0)
poz=k-1;
poz--;
for(i=1;i<n;i++){
C[0]=1;
for(j=i;j>0;j--)
C[j]=(C[j]+C[j-1])%MOD;
}
g<<C[poz];
f.close();
g.close();
return 0;
}