#include<bits/stdc++.h>
using namespace std;
int main()
{
	int m,n,i=0;
	cin>>m>>n;
	for(i=min(n,m);i>1;i--){
		if(n%i==0&&m%i==0){
			break;
		}
	}
	cout<<i<<endl;
	return 0;
}

/**************************************************************
	Problem: 1088
	User: zzz
	Language: C++
	Result: Accepted
	Time:7 ms
	Memory:2072 kb
****************************************************************/