ProcedurProgramavimas_2.19

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
long double r, l1, l2, pal=100, rez;
double pi=3.14159292035, constant=37.7;
double PI=355/113;

cin>>r;
    if(r<1000000000000000)
    {
        //2*pi*(r+h) - 2*pi*r = 100, =>  h = 50/pi
        l1=2*PI*r;
        l2=2*PI*(r+pal);

        rez=(l2-l1)/constant;

        cout<<fixed<<setprecision(3)<<rez<<endl;
    }
    else if(r>=1000000000000000)
    {
        // 50/pi => 15.915
        cout<<"15.915\n";
    }
return 0;
}