#include<bits/stdc++.h> using namespace std; int main() { double a,b,c; a=69.6-59.4; b=69.6-59.8; c=6*9.6-a-b; c/=4; printf("%5.2f",c); return 0; }

#include<bits/stdc++.h>
using namespace std;
int main()
{
	double a,b,c;
	a=6*9.6-5*9.4;
	b=6*9.6-5*9.8;
	c=6*9.6-a-b;
	c/=4;
	printf("%5.2f",c);
	return 0;
}