#include <bits/stdc++.h>
using namespace std;

//repetition
#define FOR(i,a,b) for(ll i=(a);i<(b);++i)
#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)

//container util
#define all(x) (x).begin(),(x).end()

//typedef
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VLL;
typedef vector<VLL> VVLL;
typedef vector<string> VS;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;

//const value
//const ll MOD = 1e9 + 7;
//const int dx[] = {0,1,0,-1};//{0,0,1,1,1,-1,-1,-1};
//const int dy[] = {1,0,-1,0};//{1,-1,0,1,-1,0,1,-1};

//conversion
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
inline ll toLL(string s) {ll v; istringstream sin(s);sin>>v;return v;}
template<class T> inline string toString(T x) {ostringstream sout;sout<<x;return sout.str();}


int main(){
  double a,b;
  memset(&a,0,sizeof(double));
  memset(&b,0,sizeof(double));
  cin >> a >> b;
  double ng = 0;
  double ok = a;
  int cnt = 0;
  while(cnt < 1000000){
    double mid = (ok + ng)/2;
    if(mid * b >= a) ok = mid;
    else ng = mid;
    cnt++;
  }

  char s[70] = {'\0'};
  sprintf(s,"%0.51lf\n",ok);
  int i;
  for(i = 0; i < 70; i++){
    cout << s[i];
    if(s[i] == '.') break;
  }
  for(int j = i+1; j < i+51; j++){
    cout << s[j];
  }
  cout << endl;
  return 0;
}