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#include <bits/stdc++.h>
using namespace std;

double pi = acos(-1.0);
double eps = 1e-18;
double limit = -1e10;

int main() {
    double zlr;
    bool you_are_bastard = 0;
    for(double T_T = 0.0; ; T_T -= 1e5) {
        zlr = T_T;
        if(you_are_bastard) {
            double OvO = tan(pi / 2.0 - eps);
            zlr = OvO;
            break;
        }
        if(zlr < limit) {
            you_are_bastard = 1;
        }
    }
    cout << zlr << endl;
    return 0;
}