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