/* -*- coding: utf-8 -*-
 *
 * 450.cc: No.450 ベー君のシャトルラン - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

/* typedef */

typedef long double ld;

/* global variables */

/* subroutines */

/* main */

int main() {
  ld v0, v1, d, w;
  cin >> v0 >> v1 >> d >> w;
  printf("%.9Lf\n", d * w / (v0 + v1));
  return 0;
}