#include <iostream>
#include <string>
#include <cstdio>
#include <algorithm>
#include <vector>

using namespace std;

int main(void)
{
    double ans=0;
    double a=0,b=0;

    cin >> a >> b;

    ans=a*b/100;
    cout << ans << endl;
    return 0;
}
/* For you,
                who has never forgotten 
                the magic.
                It wants you to know 
                it remembers you too.*/
/*J. M. D.  */
#include <bits/stdc++.h>
using namespace std;
#define int             long long 
#define pll             pair<int,int>
#define ppll            pair<string,pair<string, string>>
#define vvll            vector<vector<int>>
#define l_b             lower_bound
#define u_b             upper_bound
#define vll             vector<int>
#define vpll            vector<pll>
#define vc              vector <char>
#define vs              vector <string>
#define pb              emplace_back
#define p_b             pop_back()
#define prq             priority_queue
#define setbits(x)      __builtin_popcountll(x)
#define sps(x,y)        fixed<<setprecision(y)<<x
#define hell            1000000007
#define rep(i,s,n)      for(int i=s;i<n;i++)
#define ff              first
#define mem(arr,x)      memset(arr,x,sizeof(arr))
#define ss              second
#define pi              3.14159265358979323846
#define all(v)          v.begin(),v.end()
#define allr(x)         x.rbegin(),x.rend()
#define mp              make_pair
#define display(x)      for(auto dsp:x)cout<<dsp<<" "; cout<<"\n";
#define INF             1000000000000000000//18
void fast() 
{
  ios_base::sync_with_stdio(0);
  cin.tie(0); cout.tie(0);
#ifndef ONLINE_JUDGE
  freopen("input.txt", "r", stdin);
  freopen("output.txt", "w", stdout);
#endif
}
const int N = 5e6+100;
// const int BLK= 555;

//---------------------------------------------
int dr[4] = {0, 0, 1,-1};
int dc[4] = {1,-1, 0, 0};
 
int ddr[8]= {0, 0, 1, -1, 1, -1, 1, -1};
int ddc[8]= {1, -1, 0, 0, 1, -1, -1, 1};
 
int ddr1[8]= {1, 1, -1, -1, 2, 2, -2, -2};
int ddc1[8]= {2, -2, 2, -2, 1, -1, 1, -1};
//--------------------------------------------




int32_t main() {
       fast();
    // int t,z;
    // cin>>t;
    // rep(z,1,t+1){
    // cout<<"Case #"<<z<<": ";
    

    double a, b;
    cin>>a>>b;

    double ans= (a*b)/100;
    cout<<sps(ans, 6)<<"\n";
  }