KJ20231202计算分数的浮点数值
Background
两个整数a和b分别作为分子和分母，即a/b，求它的浮点数值（双精度，保留小数点后9位）
Description
Given two integers x and y, print the sum.
Format
Input
Two integers x and y, satisfying .
Output
One integer, the sum of x and y.
Samples
5 7
0.714285714
Limitation
1s, 1024KiB for each test case.