#include <stdio.h>
#include <math.h>
#define MASKA 0x01

int main()
{
    int  n,d,m,hd,n1,t,s,ds,s1;
    double sum=0,uk;
    do
    {
        printf("Unesiti granice:");
        scanf("%d %d", &n, &m);
    }
    while(n<1 || m<1 || n>m);
    d=-1;
    t=n;
    do
    {
        n1=n;
        for(hd=0;n1;)
        {
            hd=hd + (n1 & MASKA);
            n1>>=1;
        }
        s=n-t;
        for(ds=1,s1=s;s1;s1--)
        ds=ds*d;
        uk=ds*n/(double)hd;
        sum=sum + uk;
        n++;
    }
    while(n<=m);
    printf("%lf",sum);
    return 0;
}