#include <iostream>
#include <iomanip>

using namespace std;

int main(){
    int a,b,i;
    cin>>b>>a;
    for(i=a;i>=1;i--){
    	if(a%i==0&&b%i==0){
    		cout<<i<<endl;
    		break;
		}
	}
}
/**************************************************************
	Problem: 1088
	User: admin
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/