#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 m,int n){ int a=m,b=n,c=-1; while(b!=0){ c=b; b=a%b; a=c; } int ans=a; return ans; } int main(){ int m,n; cin>>m>>n; printf("%d",gcd(m,n)); return 0; }