#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<cmath>
#include<vector>
#include<queue>
#include<stack>
#include<map>
#include<ctime>
#define ll long long
#define MAXN 200005
#define uns unsigned
#define INF 0x7f7f7f7f
#define MOD 1000000007ll
using namespace std;
inline ll read(){
	ll x=0;bool f=1;char s=getchar();
	while((s<'0'||s>'9')&&s>0){if(s=='-')f^=1;s=getchar();}
	while(s>='0'&&s<='9')x=(x<<1)+(x<<3)+s-'0',s=getchar();
	return f?x:-x;
}
int a=read(),b=read();
int main()
{
	printf("%.10f\n",double(a*b)/100);
	return 0;
}
#include <bits/stdc++.h>
using namespace std;

int main(void)
{
    char s[3];

    cin >> s;

    cout << s[1] << s[2] << s[0] << endl;
    return 0;
}