#include <stdio.h>

int main(void)
{
	int A,B,surplus = 1,left,right,most_anser;
	scanf("%d %d",&A,&B);
	
	if(A+B < A*B){
		right = A+B;
		left = A*B;
	}else{
		right = A*B;
		left = A+B;
	}
	
	while(surplus != 0){
		surplus = left % right;
		//最大公約数を保存
		most_anser = right;
		left = right;
		right = surplus;
	}
	
	printf("%d",most_anser);
	return 0;
}