80WA求助

//2022tysc0784
#include<iostream>
#include<iomanip>
#include<cmath>
using namespace std;
long long a;
float b,c,d;
int main(){
    cin>>a;
    if(a>=90){
        cout<<"4.0";
    }else{
        if(a>=60){
            b=(90-a)*0.1;
            cout<<setprecision(1)<<fixed<<4.0-b;
        }else{
            b=sqrt(a)*10;
            if(b>=60){
                b=(90-a)*0.1;
                cout<<setprecision(1)<<fixed<<4.0-b;
            }else{
                cout<<"0.0";
            }
        }
    }
}