#include <iostream>
#include <fstream>
using namespace std;

ifstream in("ciur.in");
ofstream out("ciur.out");
int main()
{
    int a,i,cnt=0,cnti=0,cntj=1,j;
    for(i=1;i<=10000000;i++)
    {
       for(j=1;j<=10000000;j++)
       {
           if(j%2==0)
           {
           cnt++;
           }
       }
    }
    out<<cnt;
    return 0;
}