kept

#include <iostream>
#include <vector>
#include <queue>
#include <math.h>
#include <random>

using namespace std;


int main () {
    double  x1, y1 , a , b , c , r;


    cin>>x1>>y1>>a>>b>>c;

    r = (abs(a*x1+b*y1+c))/sqrt(a*a+b*b);
    cout<< r << endl;
    return 0;
}