#include<bits/stdc++.h>
long double a,b;
long double f(long double x)
{
return sqrt(pow(x-a-b,3));
}
int plus(int a, int b)
{
::a=a,::b=b;
long double ans1=100000000000,ans2=10000000000,ans=0;
for(int i=1;i<=50;i++)ans=ans2-f(ans2)*(ans2-ans1)/(f(ans2)-f(ans1)),ans1=ans2,ans2=ans;
return ans;
}