#include <bits/stdc++.h>
#define u using namespace std;
#define ll long long
#define s scanf
#define p printf
#define f for
#define re return
#define ii int
#define vv void
u
ii x,y,z;
ii main() {
	s("%d%d%d",&x,&y,&z);
	f(ii i = 2;;i++){
		if(!x%i && !y%i && !z%i){
			p("%d",i);
			break;
		}
	}
	re 0;
}