#include<bits/stdc++.h>
#define int long long
#define FIO ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);

using namespace std;

const int N = 2e5 + 20, M = 1e6 + 5;
const int mod = 998244353;
void debug() {
#ifdef Debug
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
#endif
}
#define ld long double
#define eps 1e-9
void getAnswer()
{
    ld x,t;
    cin >> x >> t;
    ld pa = x / (t / 6);
    ld pb = (100 - x) / (t / 3 - t / 6);
    ld lo = 0, hi = t / 3;
    ld maxi = 0;
    while(hi - lo > eps)
    {
        ld mid1 = lo + (hi - lo) / 3;
        ld mid2 = hi - (hi - lo) / 3;
        ld ans1, ans2;
        if(mid1 - t / 6 > eps)
            ans1 = x + (mid1 - t / 6) * pb;
        else
            ans1 = mid1 * pa;
        if(mid2 - t / 6 > eps)
            ans2 = x + (mid2 - t / 6) * pb;
        else
            ans2 = mid2 * pa;
        if((ans1 * (t - mid1)) - (ans2 * (t - mid2)) > eps)
            hi = mid2 - 0.0000001;
        else
            lo = mid1 + 0.0000001;
        maxi = max({maxi, ans1 * (t - mid1), ans2 * (t -mid2)});
    }
    cout << fixed << setprecision(10) << maxi << "\n";
}
signed main()
{
    FIO
    debug();
    int t = 1;
    //cin >> t;
    while(t--)
        getAnswer();
    return 0;

}