捞

#include<bits/stdc++.h>
using namespace std;
long long a,b,c,x,minn;
int main()
{
	cin>>a>>b>>c;
	for(int i=1;i<=1000000;i++)
	{
		if(a%x==b%x&&a%x==c%x&&b%x==c%x)
		{
			if(x<minn)
			minn=x;
			else
			minn=minn;
	    }
		else
		x++;
	}
	return 0;
}