#include <stdio.h>
int main()
{
	int n,i;
	long long num;
	while(scanf("%d",&n)!=EOF)
	{
		num=1;
		for(i=1;;i++)
		{
			if(num%n==0)
				break;
			num=num*10%n+1;
		}
		printf("%d\n",i);
	}
	return 0;
}