#include using namespace std; //Written by Kiritow. 求最大公约数 long gcd(long a,long b) { if(a==0||b==0) { if(a+b==0) { return 0; } return (a==0)?b:a; } while(a!=b) { if(a>b) { a=a-b; } else { b=b-a; } } return a; } int main() { int a,b; cin>>a>>b; int c=gcd(a,b); cout<