fjnu 1543 Ones

Description

Given any integer 0 <= n <= 10000 not divisible by 2 or 5, some multiple of n is a number which in decimal notation is a sequence of 1's. How many digits are in the smallest such a multiple of n?

Input

Each line contains a number n.

Output

Output the number of digits.

Sample Input

3 7 9901

Sample Output

3612

 

KEY:给定一个n，看几个连续的1可以整除他；

 

Source:

#include<iostream> 
using namespace std; 

int main() 
...{    
    unsigned n, t, T; 
    while(cin>>n) 
    ...{ 
        t=T=1; 
        t%=n; 
        while(t) 
        ...{        
            t=t*10+1; 
            T++; 
            t%=n; 
        } 
        cout<<T<<endl; 
    } 
    return 0; 
}