#include<bits/stdc++.h>
using namespace std;
int main(){
	int i,a,b;
	double x;
	scanf("%d %d",&a,&b);
	x=1.0*b*a/100;
	printf("%f\n",x);
	return 0;
}
#include <bits/stdc++.h>
using namespace std;
#define fr(a, b, c) for (int a = b; a <= c; a++)
#define rep(a, b, c) for (int a = b; a < c; a++)
#define db cout << "db: "
#define trav(a, x) for (auto &a : x)
#define all(con) con.begin(), con.end()
#define boost                         \
    ios_base::sync_with_stdio(false); \
    cin.tie(0);                       \
    cout.tie(0)
#define int long long
typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;
const int mod = 1000000007;

void solve()
{
   int A , B ;
   cin>>A>>B ; 
   float ans ; 
   ans = (A*B/100.00) ; 
   cout<<ans<<endl ; 
}

signed main()
{
    boost;
    // cout << fixed << setprecision(10);
    int start = 1;
    fr(i, 1, start) solve();

    return 0;
}
