#include<bits/stdc++.h>
using namespace std;
#define ALL(obj) (obj).begin(), (obj).end()
#define REP(i, n) for(int i = 0;i < (n);++i)
#define REPLL(i, n) for(ll i = 0;i < (n);++i)

#define endl "\n"
#define pb push_back
#define MOD 1000000007LL
#define PI 3.1415926

typedef long long ll;

template <typename T> inline T GCD(T a,T b){T c;while(b!=0){c=a%b;a=b;b=c;}return a;}
template <typename T> inline T LCM(T a,T b){T c=GCD(a,b);a/=c;return a*b;}
template <typename T> inline T nCr(T a,T b){T i,r=1;for(i=1;i<=b;i++){r*=(a+1-i);r/=i;}return r;}
template <typename T> inline T nHr(T a,T b){return nCr(a+b-1,b);}
template <typename T> inline T POW(T a,T b){int i,r=1;for(i=1;i<=b;i++){r*=a;}return r;}

int main(void){
	cin.tie(0);
	// ios::sync_with_stdio(false);

	double p, q;cin >> p >> q;
	p /= 100.0; q /= 100.0;
	double numer = p*q, denom = p*q + (1-p)*(1-q);
	printf("%.13f\n", numer/denom*100.0);

	return 0;
}