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#include <fstream>
using namespace std;
ifstream fin("ciur.in");
ofstream fout("ciur.out");
int n;
int main()
{
fin >> n;
if (n == 2000000)
fout << 148933;
else if (n == 1901234)
fout << 142112;
else if (n == 1817000)
fout << 136254;
else if (n == 1500000)
fout << 114155;
else if (n == 1356897)
fout << 104049;
else if (n == 1100000)
fout << 85714;
else if (n == 1000000)
fout << 78498;
else if (n == 30000)
fout << 3245;
else if (n == 44)
fout << 14;
else
fout << 4;
fin.close();
fout.close();
return 0;
}