POJ 2551

#include<iostream>
#include<stdio.h>
#include<string>
using namespace std;

//int my_pow(int ,int );
int main()
{
    //freopen("acm.acm","r",stdin);
    int s;
    int i;
    int num;
    while(cin>>s)
    {
        num = 0;
        for(i = 0; ; ++ i)
        {
            num =  num*10 + 1;
            if(num % s == 0)
            {
                cout<<i+1<<endl;
                break;
            }
            else
            {
                num %= s;
            }
        }
        //cout<<num<<endl;
        

    }
}
/*int my_pow(int a,int b)
{
    if(b == 0)
        return 1;
    else
    {
        return a*my_pow(a,b - 1);
    }
}*/