#include <bits/stdc++.h>

using namespace std;

int main()
{
	int a,b,x;
	//其父亲节点编号为[n/2]
	while(cin >> a >> b)
	{
		while(a != b)
		{
			if(a > b) a /= 2;
			else b /= 2;
		}
		cout << a << endl;
	}
	return 0;
}