#include <stdio.h>
#include <math.h>

int main(void){
    int P, Q;
    double N = 1, t = 10000;

    scanf("%d %d", &P, &Q);

    while(t > 0.000001){
        while(N * N <= P + Q * N * log2(N)) N += t;
        N -= t;
        t /= 10;
    }

    printf("%f", N);
    
    return 0;
}