N = int(input())
if N==1 or N==3 or N==9:
    print(1)
else:
    if N%9==0:
        N = N//9
    n = 1
    cnt = 1
    for k in range(2,N):
        n = (n*10)%N
        cnt += n
        if cnt%N==0:
            print(k)
            break