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