1086번문제

#include <iostream>
#include<stdio.h>
using namespace std;

//1085
int main() {
	
	int w, h, b;

	cin >> w >> h>> b;
	double r = 0;
	r = (w * h * b) / 1024 / 1024 / 8;
	cout << r;
	
	return 0;
}