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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.*;
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int k = sc.nextInt();
        int cnt = 0;
        int ans = 0;

        if(a >= b){
            for(int i = a;i > 0;i--){
                if(a%i == 0 && b%i == 0){
                    ans = i;
                    cnt++;
                    if(cnt == k)
                    break;
                }
            }
        }else{
            for(int i = b;i > 0;i--){
                if(a%i == 0 && b%i == 0){
                    ans = i;
                    cnt++;
                    if(cnt == k)
                    break;
                }
            }
        }
        System.out.println(ans);
    }
}