#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()\fabs() #include<ctime> #include<cstdlib> using namespace std; int w(int a,int b){ if(a%b==0) return b; else return w(b,a%b); } int main(){ int a,b; cin>>a>>b; cout<<w(a,b)<<endl; return 0; }