#include<iostream> // cin\cout\endl #include<cstdio> //scanf()\printf() #include<cstring> // strcpy()\strcat()\strcmp()\strlen()\memset() #include<cmath> //sqrt()\pow()\abs()\ceil()\floor()\max()\min() using namespace std; int w(int a,int b){ if(a%b==0) return b; else{ return w(b,a%b); } } int main(){ int d,f; cin>>d>>f; cout<<w(d,f); return 0; }