Is l1-029 too fat (5 points)

L1-029 Is it too fat (5 branch )

It is said that a person's standard weight should be his height （ Company ： centimeter ） subtract 100、 Multiplied by 0.9 The kilogram obtained . It is known that the value of the market weight is twice that of the kilogram . Now give someone height , Please calculate the standard weight ？（ By the way, I'll calculate it for myself ……）

Input format ：
The first line of input gives a positive integer H（100 < H ≤ 300）, For someone's height .

Output format ：
Output the corresponding standard weight in one line , Unit: market Jin , After decimal point 1 position .

sample input ：

169

sample output ：

124.2

AC Code

#include<iostream>
#include<algorithm>
#include<cstring>
#include<cmath>
#include<vector>
#include<stack>
#include<queue>
#include<sstream>

using namespace std;
typedef long long ll;
const int N=100010;

int main()
{
    
	int n;
	cin >> n;
	n -= 100;
	printf("%.1lf",n * 0.9 * 2);
	return 0;
}