#include<bits/stdc++.h>
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: yangjunwen
	Language: C++
	Result: Accepted
	Time:9 ms
	Memory:2072 kb
****************************************************************/