#include <stdio.h>

int main(void)
{
	int w,wDo,d,i;
	scanf("%d",&w);
	scanf("%d",&d);

	for (i=0;i<d;i++) {
		wDo = (int)((double)w / (d-i) / (d-i));
		w -= wDo;
	}
	printf("%d\n",wDo);
	
	return 0;
}