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

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

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

    while(N * N <= P + Q * N * log2(N)) N++;
    N--;
    while(N * N <= P + Q * N * log2(N)) N += 0.0001;
    N -= 0.0001;
    
    printf("%f", N);
    
    return 0;
}