#include <bits/stdc++.h>
#define x first
#define y second
#define point pair<double,double>
#define DIM 1000

using namespace std;
ifstream f("camera.in");
ofstream g("camera.out");

void Print()
{
    g<<setprecision(2)<<fixed;
    g<<sqrt(-1);
    g.close();
}
int main()
{
    Print();
    return 0;
}