#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){ while(b){ int t=a%b; a=b; b=t; } return a; } int main(){ int n,m; cin>>n>>m; cout<<gcd(n,m); } return 0; }