#include <bits/stdc++.h>
#define int long long
#define loop(i, a, b) for (int i = a; i < b; i++)
#define loope(i, a, b) for (int i = a; i <= b; i++)
#define bloop(i, a, b) for (int i = a; i >= b; i--)
#define FastIO                        \
    ios_base::sync_with_stdio(false); \
    cin.tie(NULL);                    \
    cout.tie(NULL)
#define PRECISION                      \
    std::cout.unsetf(std::ios::fixed); \
    std::cout.precision(9)
#define scan(a, n)              \
    for (int i = 0; i < n; i++) \
    cin >> a[i]
#define print(a, n)             \
    for (int i = 0; i < n; i++) \
    {                           \
        cout << a[i] << ' ';    \
    }                           \
    cout << '\n'
using namespace std;
int mod = 1e9 + 7;

void solve()
{
    long double a,b;
    cin>>a>>b;
    cout<<a*(b/100)<<"\n";
}

int32_t main()
{
    FastIO;
    PRECISION;
    int t = 1;
    // cin >> t;
    while (t--)
    {
        solve();
    }
    return 0;
}
#include <bits/stdc++.h>

using namespace std;

#define flush cout.flush

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pl = pair<ll, ll>;
const ll INF = 1e9 + 7;
const ll mod = 1e9 + 7;
const ll mod2 = 998244353;
const ld eps = 1e-9;
const ld PI = acos(-1);

int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    ld a, b;
    cin >> a >> b;
    a /= 100;
    cout << fixed << setprecision(20);
    cout << a * b << "\n";
    return 0;
}