#include<bits/stdc++.h>
#define lf double
using namespace std;
lf a,b,c,d,l,r;
int main(){
    cin>>a>>b>>c>>d>>l>>r;
    lf x1=((a*d-b*c)*log(a*r+b))/(a*a);
    lf x2=((b*c-a*d)*log(a*l+b))/(a*a);
    lf x3=c*r/a;
    lf x4=l*c/a;
    printf("%.6lf\n", (double)(x1+x2+x3-x4));
}