double deter(double A[6][6], int n)
{
    double b[6][6],d = 0;
	int k = 1;
	if(n==1) d = A[1][1];
	else if(n==2) d = A[1][1]*A[2][2]-A[1][2]*A[2][1];
	else if(n==3) d = A[1][1]*A[2][2]*A[3][3]+A[2][1]*A[3][2]*A[1][3]+A[1][2]*A[2][3]*A[3][1]-A[3][1]*A[2][2]*A[1][3]-A[2][1]*A[1][2]*A[3][3]-A[1][1]*A[2][3]*A[3][2];
	else {
		for(int g = 1; g<=n;g++){
		for(int i = 2; i<=n; i++){
			for(int j = 1; j<=n-1;j++){
				if(k==j) continue;
				else{
					b[i][j] = A[i][j];

				}
			}
		}
		d += pow(-1,k-1)*A[1][g]*deter(b,n-1);
		k++;
		}
	}
	return d;
}