#include <stdio.h>

int main(){
	long work, day;
	scanf("%ld %ld",&work,&day);
	
	int motivation = 0;
	while(day > 1){
		motivation = work / (day * day);
		//printf("モチベ%d 残り日数；%d\n",motivation,day);
		work -= motivation;
		day -= 1;
	}
	printf("%ld",work);
}