Problem:
Score : 300 points

Problem Statement

Takahashi loves the number 7 and multiples of K.

Where is the first occurrence of a multiple of K in the sequence 7,77,777,\ldots? (Also see Output and Sample Input/Output below.)

If the sequence contains no multiples of K, print -1 instead.

Constraints

1 \leq K \leq 10^6

K is an integer.

Input

Input is given from Standard Input in the following format:

K

Output

Print an integer representing the position of the first occurrence of a multiple of K. (For example, if the first occurrence is the fourth element of the sequence, print 4.)

Sample Input 1

101

Sample Output 1

4

None of 7, 77, and 777 is a multiple of 101, but 7777 is.

Sample Input 2

2

Sample Output 2

-1

All elements in the sequence are odd numbers; there are no multiples of 2.

Sample Input 3

999983

Sample Output 3

999982

Solution in Python (3.8.2) (judge verdict: Accepted)

#!/usr/bin/env python3


def main():
    k = int(input())
    num = 0
    soeji = 0
    ar = [0 for _ in range(k)]

    while True:
        # print(soeji)
        if ar[soeji] > 0:
            break
        ar[soeji] = num
        soeji = (soeji * 10 + 7) % k
        num += 1

    print(-1 if ar[0] == 0 else ar[0])


if __name__ == '__main__':
    main()