#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 gcd(int a,int b){ int c=a%b; if(c==0) return b; a=b; b=c; return gcd(a,b); } int main(){ int a,b; cin>>a>>b; cout<<gcd(a,b)<<endl; return 0; }