Description

Input

Output

Sample Input

32 63
2016 2016
1000000000 1000000000

Sample Output

1
30576
7523146895502644

HINT

Source

我去湖南也會爆零-----------

程式碼：

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
#define LL long long
int A[2020]; 
int shu[100];
int main()
{
	LL n,m;
	for (int i=1;i<=2016;i++)
	{
		if (2016%i==0)
		{
			for (int j=i;j<=2016;j+=i)
			A[j]=2016/i;
		}
	}
	while(~scanf("%lld%lld",&n,&m))
	{
		LL a=n/2016;
		LL b=n%2016;
		a++;
		if (b==0) a--;
		LL s=0;
		for (int i=1;i<=2016&&i<=n;i++)
		{
			s+=m/A[i]*a;
			if (i==b)
			a--;
		}
		printf("%lld\n",s);
	}
	return 0;
}