#include <bits/stdc++.h> using namespace std; double x, y; int main() { cin >> x >> y; if (x <= 6000) { cout << fixed << setprecision(2) << max(x * 0.85, x - 500) - y; } else { cout << fixed << setprecision(2) << max(x * 0.9, x - 1000) - y; } return 0; }

#include<bits/stdc++.h> using namespace std; int main(){ double a,b; cin>>a>>b; if(a<=6000){ if(a0.15>=500){ printf("%.2lf",a-500-b); } else printf("%.2lf",a0.85-b); } else{ if(a0.1>=1000){ printf("%.2lf",a-1000-b); } else printf("%.2lf",a0.9-b); } return 0;

#include<bits/stdc++.h>
using namespace std;
int main(){
	int x,y;
	cin>>x>>y;
	double h=0;
	if(x<=6000){
		double a=x*0.15;
		if(a>500){
			a=500;
		}	
	h=x-a-y;	
	}else{
		double b=x*0.1;
		if(b>1000){
			b=1000;
		}
		h=x-b-y;
	} 
	
	printf("%.2lf",h);
```


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