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

int dev(int a, int b, int p);
int calcb(int a, int p);

int main(int argc, char *argv[])
{
    int p = 2000000;
    int a, b;
    int d1, d2; //dev of b, dev of b+1
    int cd, td; //current dev, min dev
    int tb, ta; //best a and b
    
    ta = tb = td = -1;
    for(a = 1; (b = calcb(a, p)) + 1 >= a; ++a){
        d1 = dev(a, b, p);
        d2 = dev(a, b + 1, p);
        cd = d1 > d2 ? d2 : d1;
        b += (d2 == cd);
        if(cd < td || td == -1){
            //smaller deviation
            td = cd;
            tb = b;
            ta = a;
        }
    }
    //printf("a = %d\nb = %d\ndev = %d\narea = %d\n", ta, tb, td, ta*tb); 
    printf("%d\n", ta*tb);
}

//calculate b
int calcb(int a, int p)
{
    return (sqrt(1 + ((float) 16*p)/(a*a + a)) - 1)/2;
}

//eval deviation
int dev(int a, int b, int p)
{
    return abs(a*b*(a + 1)*(b + 1)/4 - p);
}