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