static void Main(string[] args)
{
var R = Scan.BigInt();
var B = Scan.BigInt();
var x = Scan.BigInt();
var y = Scan.BigInt();
var max_r = R / x;
var max_b = B / y;
if (max_r == 0 && max_b == 0)
{
Console.WriteLine(0);
}
else if (max_r == 0)
{
Solve(B, R, y, x);
}
else
{
Solve(R, B, x, y);
}
}