#include<bits/stdc++.h> using namespace std; double a; int main(){

cin>>a;
if(a<=150){
	printf("%.1lf",a*0.4463);
}
else if(a>=151&&a<=400){
	printf("%.1lf",150*0.4463+(a-150)*0.4663);
}
else if(a>=401){
	printf("%.1lf",150*0.4463+(400-150)*0.4663+(a-400)*0.5663);
}

return 0;

}

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