#include <iostream>
#include <iomanip>
void formatMeasurement() {
    double measurement;
    if (!(std::cin>>measurement)){
        return
    }
    std::cout << std::fixed << std::setprecision(6)<< measurement << std::end1;
}
int main() {
    std::ios_base::sync_with_stdio(false);
    std::cin.tie(NULL);
    formatMeasurement();
    return 0;
}