#include <iostream>
#include <cmath>
using namespace std;
void main ()
{
    int a,b,c;
    float y;
    cout<<"Unesite a i b: \m";
    cin>>a>>b;
    y=a/float(b);
    if(b==13||(b>127&&b<=255)||b==a)
        cout<<y;
    else if(a>0&&!(a%19==0)&&!(a>=111&&a<555)&&b!=0&&a>(3*b))
        cout<<y;
    else
    {
        cout<<"Unesite broj c: \n";
        cin>>c;
        cout<<y=a*b/sqrt(float(c));
    }
    system ("pause>0");
}