#include
#include
#include
using namespace std;
double lnsqr(double y)
{
y*=y;
y=log(y);
return y;
}
int main(int argc, char *argv[])
{
double x,a,b,c;
cin >>a; cin>>b; cin>>c;
x=lnsqr(a)+lnsqr(b)+lnsqr(c);
cout <<"x= "<<x<<endl;<br> system("pause");
cin.get();
return EXIT_SUCCESS;
}