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