#include<bits/stdc++.h>
using namespace std;
int gcd(int a,int b)
{
	return b==0?a:gcd(b,a%b);
}
int main()
{
	int x,y,z;
	cin>>x>>y>>x;
	cout<<gcd(gcd(x,y),gcd(y,z))<<endl;
	return 0;
}