pr1a.tema

#include<iostream>
using namespace std;
int main ()
{
    int x,x2=0,p=1;
    cin>>x;
    do
    {

        if(x%10<5)
        {
            x2=x2+x%10*p;
            p=p*10;

        }
        else
        {
            x2=x2+0;
        }

        x=x/10;

    }
    while(x!=0);
    cout<<x2;
    return 0;
}