Problem:
Score : 200 points

Problem Statement

You are given positive integers A and B.

Find the K-th largest positive integer that divides both A and B.

The input guarantees that there exists such a number.

Constraints

All values in input are integers.

1 \leq A, B \leq 100

The K-th largest positive integer that divides both A and B exists.

K \geq 1

Input

Input is given from Standard Input in the following format:

A B K

Output

Print the K-th largest positive integer that divides both A and B.

Sample Input 1

8 12 2

Sample Output 1

2

Three positive integers divides both 8 and 12: 1, 2 and 4.
Among them, the second largest is 2.

Sample Input 2

100 50 4

Sample Output 2

5

Sample Input 3

1 1 1

Sample Output 3

1

Solution in Python (3.8.2) (judge verdict: Runtime Error)

A,B,K=map(int,input().split())

def ans120(A:int, B:int, K:int):
    l=sorted([A,B])
    ans_list=[]
    for i in range(1,l[1]):
        if A%i==0 and B%i==0:
            ans_list.append(i)
    return ans_list[-K]

print(ans120(A,B,K))