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