#include<bits/stdc++.h>
using namespace std;
int main()
{
	int m,n,i,max=0;
	cin>>m>>n;
	for(i=1;i<=min(m,n);i++){
		if(m%i==0&&n%i==0){
			if(max<i)
			max=i;	
		}
	}
	cout<<max;
return 0;
}
/**************************************************************
	Problem: 1088
	User: houshanglin
	Language: C++
	Result: Accepted
	Time:8 ms
	Memory:2072 kb
****************************************************************/