#include <stdio.h>
#include <stdlib.h>

int main()
{
    double x,y;
    scanf("%lf %lf", &x, &y);
    if(x<2*y){printf("%g", x*x-y*y*y*y);}
    else{printf("%g", x*x*x*x+y*y);}
    return 0;
}