start_counter();
		A = randmatrix(size);
 		// printmatrix(size, A, 'A');
		B = randmatrix(size);
		// printmatrix(size, B, 'B');
		C = mmul(size, A, B);
		// printmatrix(size, C, 'C');
		fprintf(file, "%d %f\n", size, get_counter());

		free(A);
		free(B);
		free(C);