#include<stdio.h>
int main()
{
    int a,b,i,gcd=1;
    if (scanf("%d %d",&a,&b)!=2;
    {
        printf("Invalid input");
    }
    if(a<0)a=-a;
    if(b<0)b=-b;
    for(i=1;i<=a&&i<=b;i++)
    {
        if(a%i==0&&b%i==0)
        {
            gcd=i;
        }
    }
    printf("%d",gcd)
}