numar cu cifre <=5

#include<iostream>
using namespace std;
int main ()
{
    int x, r=0, p=1;
    cin>>x;
    while (x!=0)
    {
        if (x%10<=5)
        {
            r=r+x%10*p;
            p=p*10;
        }
        x=x/10;
    }
    cout<<r;
    return 0;
}