#include<iostream> using namespace std; int main(){ int a,b,i; cin>>a>>b; /* i=a%b; while(i!=0){//辗转相除法(欧几里得算法) a=b; b=i; i=a%b; } cout<<b<<endl; */ do{ i=a%b; a=b; b=i; }while(i!=0); cout<<a<<endl; return 0; }