/*himanshukm2301*/
#include <bits/stdc++.h>
using namespace std;

#define hyperspeed           \
    ios::sync_with_stdio(0); \
    cin.tie(0);
#define INF 1000000000000000003
typedef long long ll;
typedef vector<ll> vi;
typedef pair<ll, ll> pi;
#define PB push_back
#define PF push_front
#define POB pop_back
#define MP make_pair
#define ff first
#define ss second
#define BS binary_search
#define LB lower_bound
#define UB upper_bound
#define all(x) (x).begin(),(x).end()
#define ln(x) (ll)x.length()
#define sz(x) (ll)x.size()
#define nl '\n'
#define goog(x) cout<<"Case #"<<i<<": ";
#define MAX 1000006

const unsigned int MOD = 1000000007;

inline ll ceilM(ll a, ll b) { return (a / b) + ((a % b) != 0);} //O(1);
ll gcd(ll a, ll b) {if (a == 0)return b; return gcd(b % a, a);} //O(log min(a, b));
bool isPrime(ll n) {if (n < 2) return 0; ll i = 2; while (i * i <= n) {if (n % i == 0) return 0; i++;} return 1;} //(O(sqrt(n)))

ll arr[MAX];

void solve()
{
	//cout << "hey" << endl;
	ll a, b;
	cin >> a >> b;
	double ans = (b * a) / 100.0;
	cout << fixed << setprecision(7) << ans << endl;

}

int main()
{
	hyperspeed;

#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif


	solve();

	return 0;
}

#include <bits/stdc++.h>
using namespace std;
#define   IOS ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define   mp make_pair
#define   pb push_back
#define   ll long long
#define   ld long double
#define   debug(x)  cout << '[' << #x << " is: " << x << "] " << endl;
#define   rsor(v)   sort(v.rbegin() , v.rend());
#define   rev(v)    reverse(v.begin() , v.end());
#define   sz(x)     (int)(x).size()
#define   all(x)    x.begin(), x.end()
#define  _cout(v)  for(auto f : v ) cout << f << " " ;
#define  _cin(v)   for(auto &it : v)cin >> it ;
#define  vi vector<int>
#define  fs first
#define  sc second

const int mod =1e9+7;
int32_t main() {
    IOS;
    int a,b,c;
    cin>>b>>c;
    if(b==0||c==0){
        cout<<0;
        return 0;
    }
    cout<<fixed<<setprecision(5);
    cout<<(long double)(b*c)/100;

}
