#include <iostream>
#include <cmath>
#include <cstdio>
using namespace std;

int main()
{
    //f(x) 是先增后减函数
    int a,b;
    cin>>a>>b;
    double x = 1 / (b*(log(a)));
    double res = log(x)/log(a) - b * x;
    printf("%.10f\n",res);
    return 0;
}