#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 h1,h2,i; cin>>h1>>h2; if(h1>h2) i=h2; else i=h1; while(i>=1){ if(h1%i==0&&h2%i==0) break; i--; } cout<<i<<endl; return 0; }