#define _USE_MATH_DEFINES

#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair
#include <tuple>        //tuple
#include <deque>		//deque
#include <climits>		//INT_MAX
#include <bitset>		//bitset
#include <cmath>		//sqrt, ceil. M_PI, pow, sin
#include <ios>			//fixed
#include <iomanip>		//setprecision
#include <sstream>		//stringstream
#include <numeric>		//gcd, assumlate
#include <random>		//randam_device
#include <limits>		//numeric_limits
#include <functional>

using namespace std;
constexpr long long int D_MOD = 1000000007;

int main() {

	int A, B, X, Y;
	cin >> A >> B >> X >> Y;

	int64_t temp1 = X * (A + B);
	int64_t temp2 = Y * (A + B);

	double a = temp1 / (double)A;
	double b = temp2 / (double)B;

	if (a < b) {
		cout << fixed << setprecision(12) << a << endl;
	}
	else {
		cout << fixed << setprecision(12) << b << endl;
	}

	return 0;

}