transport

#include<iostream>
using namespace std;
int transport(int a)
{
    int d=;
    if(a<=)
        return ;
    else
        a=a/;
    d=;
        while(d>)
        {
            a=a*+;
            d--;
        }
        return a;
}
int  main()
{
    int a,b;
    cin>>a;
    b=transport(a);
    if(b==)
        cout<<"error!"<<endl;
    else
        cout<<b<<endl;
    return ;
}