#include<bits/stdc++.h>
using namespace std;
using Int=long long;
using Real=long double;
template<class T>inline bool chmin(T&A,T B){return(A>B?A=B,1:0);}
template<class T>inline bool chmax(T&A,T B){return(A<B?A=B,1:0);}
#define REP(i,n)for(int i=0;i<(n);++i)
#define REP1(i,n)for(int i=1;i<=(n);++i)
#define ALL(x)begin(x),end(x)
#define drop(x){cout<<(x)<<'\n';return;}
string V;
int T;
void sol()
{
	cin>>V>>T;
	cout<<(stoi(V[0]+V.substr(2,4))*T/10000)<<"\n";
}
main()
{
	ios::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);
	cout<<fixed<<setprecision(16);
	int T=1;
	//cin>>T;
	while(T--)sol();
}