/*
BY: shalekberli (Shahin Alekberli)
LANG: C++
*/
#include <bits/stdc++.h>
//MACROS//
#define PVP ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define _crt_secure_no_warnings
#define endl '\n'
#define pb push_back
#define mp make_pair
#define gf greater<int>()
#define INF 0x3F3F3F3F
#define sz(x) (int)x.size()
#define all(v) v.begin(), v.end() 
#define UB upper_bound
#define LB lower_bound
#define F first
#define S second
#define MAX 100000000
#define mod 1000000007LL
#define MOD 998244353LL
#define MoD 16714589LL
#define Max 1e18
#define ll long long
#define lld long double
#define usi unsigned int
#define pll pair<ll, ll>
#define pii pair<int, int>
#define loop1(i, n) for (ll i = 1; i <= (n); i++)
#define loop0(i, n) for (ll i = 0; i < (n); i++)
#define loop(i, k, n) for(ll i = (k);i <= (n);i++)
#define loopr(i, k, n) for (ll i = (k); i >= (n); i--)
using namespace std;

int main(){
	PVP
	double a, b; cin >> a >> b;
	cout << a * (b / 100);
	return 0;
}
#include <iostream>
using namespace std;
int main(){
  int a,b;float x=0;
  cin>>a>>b;
  x=float(a*b)/100.0;
  cout<<x;
  return 0;
}