#include <bits/stdc++.h>
using namespace std;
int main()
{
    int a,b,c,x=2;
    cin >> a >> b >> c;
    while(1)
    {
    	if(a%x==0&&b%x==0&&c%x==0)
    	{
    		cout << x;
    		break;
		}
		x++;
	}
}