L1-029. 是不是太胖了

//AC

#include <iostream>#include <cstdlib>#include <stdio.h>#include <algorithm>#include <math.h>#include <string.h>#include <queue>#include <stack>#include <vector>#include <map>#include <set>typedef long long ll;using namespace std;int main(){    int n;    scanf("%d",&n);    printf("%.1f\n",(n-100)*0.9*2);    return 0;}