#include<bits/stdc++.h>
#define ll long long
using namespace std;
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    ll a,b;
    cin>>a>>b;
    double ans=(double)a*b;
    ans=(double)ans/100;
    cout<<setprecision(10)<<ans<<"\n";
}

//   PIGMEISTER™   //

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define ld long double
#define sidha(i,x,n) for(ll i=(ll)(x);i<(ll)(n);++i)
#define ulta(i,x,n) for(ll i=(ll)(x);i>=(ll)(n);--i)
#define sab(a) a.begin(),a.end()
#define bas(a) a.rbegin(),a.rend()
#define test ll _;cin>>_;while(_--)
#define jaldi ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL)
//#define MAX 100005
#define PI (ld)3.141592653589793238
#define MOD LLONG_MAX
//#define MOD (ll)1000000007
//#define MOD (ll)998244353

int main()
{
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    jaldi;
    
    ld a, b;
    cin >> a >> b;
    cout << b * (ld)(a / (ld)100);
    
    return 0;
}
