#include<stdio.h>
int main()
{
    int n,m;
    scanf("%d%d",&n,&m);
    if(n<=0||n>100||m>100)
    {
        printf("Invalid input");
        return 0;
    }
    else
    {
        while(n!=0)
        int temp=m;
        m=n%m;
        n=temp;
    }
    
    printf("%d",n));
    return 0;
}