#include <iostream>
#include <math.h>
using namespace std;
int main () {
double x, f;
cout<<"x=";
cin>>x;
if ( x<=-7) f = -x * 6 + 20;
// Daca -6x + 20 x<=-7;
if ( x>-7 && x<=0 ) f = x +30;
//Daca X + 30 -7<x<=0
if (x>0) f = sqrt (x);
//
cout<<"f"<<f<<'\n';
return 0;
}
I2luY2x1ZGUgPGlvc3RyZWFtPgojaW5jbHVkZSA8bWF0aC5oPgp1c2luZyBuYW1lc3BhY2Ugc3RkOwppbnQgbWFpbiAoKSB7CmRvdWJsZSB4LCBmOwpjb3V0PDwieD0iOwpjaW4+Png7CmlmICggeDw9LTcpIGYgPSAteCAqIDYgKyAyMDsKLy8gRGFjYSAtNnggKyAyMCAgIHg8PS03OwppZiAoIHg+LTcgJiYgeDw9MCApIGYgPSB4ICszMDsKLy9EYWNhIFggKyAzMCAgICAgIC03PHg8PTAKaWYgKHg+MCkgZiA9IHNxcnQgKHgpOwovLwpjb3V0PDwiZiI8PGY8PCdcbic7CgoKCglyZXR1cm4gMDsKfQ==