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#include <fstream>
using namespace std;
int st[20], n, nrsol=0;
int DeterminareMaxim(int k)
{ int maxim=0,i;
for(i=1;i<=k;i++)
if (st[i]>maxim) maxim=st[i];
return maxim;
}
void Back(int k)
{ int i;
for(i=1;i<=DeterminareMaxim(k-1)+1;i++)
{ st[k]=i;
if (k==n) nrsol++;
else Back(k+1);
}
}
int main()
{
ifstream f("dirichlet.in");
ofstream g("dirichlet.out");
f>>n;
Back(1);
g<<nrsol;
return 0;
}