#include <iostream>
using namespace std;
int main(int argc, char* argv[])
{
	double v;
	int t;
	cin>>v>>t;
	v=v*10000;
	double d=v*t;
	if (d!=(int)d){
		d+=0.5;
	}

	d/=10000;
	cout<<(int)d<<endl;
	return 0;
}