#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 main(){ int a,b,t; cin>>a>>b; if(a>b) t=b; else t=a; while(t>=1){ if(a%t==0&&b%t==0){ break; } t--; } cout<<t<<endl; return 0; }