#include<bits/stdc++.h>
using namespace std;
 
#define ll long long
#define println(x) cout<<x<<"\n"
#define print(x) cout<<x
#define prints(x) cout<<x<<" "
#define printAr(x,n) for(int i=0;i<n;i++)cout<<x[i]<<" ";cout<<"\n";
#define inAr(x,n) for(ll i=0;i<n;i++)cin>>x[i]
#define IN ({ ll TEMP; cin>>TEMP; TEMP;})
#define SN ({ string TEMP; cin>>TEMP; TEMP;})
#define CN ({ char TEMP; cin>>TEMP; TEMP;})
 
const ll INF = 9e18;
const int mod = 1e9+7;
const ll N = 1e4+10;
 
 
 
void solve(){
    double a, b;
    cin>>a>>b;
    cout<<fixed;
    cout<<setprecision(5)<<a*b<<"\n";
}
 
int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);
    int t= 1;
    //cin>>t;
    for(int i=1; i<=t; i++){
        //cout<<"Case "<<i<<": ";
        solve();
    }
    return 0;
}