#include<iostream>
using namespace std;
int main()
{
	int num,time;
	double lx,ll;
	cout<<"put the num"<<endl;
	cin>>num;
	cout<<"put the time"<<endl;
	cin>>time;
	cout<<"put the li lv"<<endl;
	cin>>ll;
	lx=num*time*ll*0.8;
	cout<<"li xi is "<<lx<<endl;
	return 0;
}