You have a fraction <image>. You need to find the first occurrence of digit c into decimal notation of the fraction after decimal point.

Input

The first contains three single positive integers a, b, c (1 ≤ a < b ≤ 105, 0 ≤ c ≤ 9).

Output

Print position of the first occurrence of digit c into the fraction. Positions are numbered from 1 after decimal point. It there is no such position, print -1.

Examples

Input

1 2 0


Output

2

Input

2 3 7


Output

-1

Note

The fraction in the first example has the following decimal notation: <image>. The first zero stands on second position.

The fraction in the second example has the following decimal notation: <image>. There is no digit 7 in decimal notation of the fraction. 
a,b,c=[int(i) for i in input().split()]
from decimal import Decimal,getcontext
getcontext().prec = 10000
def main():
    result=round(Decimal(a)/Decimal(b),10000)
    string=str(result)
    string=string[2:]
    comp=str(c)
    for i in range(10000):
        if string[i]==comp:
            print(i+1)
            return 0
        if i == 9998:
            print(-1)
            return 0
main()