#include<iostream>
#include<string>
#include<algorithm>
#include<vector>
#include<queue>
#include<map>
#include<math.h>
#include<iomanip>
#include<set>
#include<numeric>
#include<cstring>
#include<cstdio>
#include<functional>
#include<bitset>
#include<limits.h>
#include<cassert>
#include<iterator>
#include<complex>
#include<stack>
using namespace std;
#define lint long long int
/*
vector<char>al(26);
al = {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
vector<char>AL(26);
AL = {'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
*/

int main() {
	int A, B, X, Y;
	cin >> A >> B >> X >> Y;
	double a, b, x, y;
	a = A;
	b = B;
	x = X;
	y = Y;
	if (a / b > x / y) {
		int ans = 0;
		ans = A * X + B * X;
		cout << ans / A;
		cout << '.';
		ans = ans % A * 10;
		for (int ia = 0; ia < 10; ia++) {
			cout << ans / A;
			ans = ans % A * 10;
		}
	}
	else if (a / b < x / y) {
		int ans = 0;
		ans = B * Y + A * Y;
		cout << ans / B;
		cout << '.';
		ans = ans % B * 10;
		for (int ia = 0; ia < 10; ia++) {
			cout << ans / B;
			ans = ans % B * 10;
		}
	}
	else {
		cout << X + Y << endl;
	}
}