#include
#include
#include
using namespace std;
int main ()
{
double r;
while(cin>>r)
{
printf("%.2lf\n",fabs(r));
}
}
#include
#include
#include
using namespace std;
int main ()
{
double r;
while(cin>>r)
{
printf("%.2lf\n",fabs(r));
}
}