Experimental Educational Round: VolBIT Formulas Blitz（J）打表找规律

J. Divisibility

time limit per test
0.5 seconds

memory limit per test
64 megabytes

input
standard input

output
standard output

IT City company developing computer games invented a new way to reward its employees. After a new game release users start buying it actively, and the company tracks the number of sales with precision to each transaction. Every time when the next number of
sales is divisible by all numbers from 2 to 10 every
developer of this game gets a small bonus.

A game designer Petya knows that the company is just about to release a new game that was partly developed by him. On the basis of his experience he predicts that n people
will buy the game during the first month. Now Petya wants to determine how many times he will get the bonus. Help him to know it.

Input

The only line of the input contains one integer n (1 ≤ n ≤ 1018)
— the prediction on the number of people who will buy the game.

Output

Output one integer showing how many numbers from 1 to n are
divisible by all numbers from 2 to 10.

Examples

input

3000

output

1

题意：1-n中能整除2-10的数字个数

题解：很明显，数字太大不能枚举，那么打个表，发现周期是2520

#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<vector>
#include<set>
#include<string>
using namespace std;
#define N 1000+5

typedef long long LL;  
int main()
{
#ifdef CDZSC
	freopen("i.txt","r",stdin);
#endif
	LL n;
	cin>>n;
	printf("%lld\n",n/2520);
	return 0;
}