#include <iostream>
template<typename T, std::size_t n>
class SquareMatrix{
public:
    void invert();
};

template<typename T, std::size_t n>
void SquareMatrix<T, n>::invert()
{
    T num = n * 5;
}

int main()
{
    SquareMatrix<double, 5> a;
    a.invert();
    return 0;
}