diff --git a/ex3/seq/check_all b/ex3/seq/check_all
old mode 100755
new mode 100644
diff --git a/ex3/seq/jacobi_oo_stl/Makefile b/ex3/seq/jacobi_oo_stl/Makefile
old mode 100755
new mode 100644
diff --git a/ex5/code/task_2-5/Makefile b/ex5/code/task_2-5/Makefile
index 6af71b9..da8238d 100644
--- a/ex5/code/task_2-5/Makefile
+++ b/ex5/code/task_2-5/Makefile
@@ -10,7 +10,7 @@ WARNINGS = -Wall -pedantic -Wextra -Weffc++ -Woverloaded-virtual -Wfloat-equal -
            -Wredundant-decls -fmax-errors=1
 
 CXXFLAGS   = -g -flto -O3 -ffast-math -march=native -fopenmp ${WARNINGS}
-LINKFLAGS  = -g -flto -O3 -lopenblas -llapacke -fopenmp
+LINKFLAGS  = -g -flto -O3 -lopenblas -llapacke -fopenmp -ltbb
 
 
 all: ${PROGRAM}
@@ -28,4 +28,4 @@ clean:
 
 run: ${PROGRAM}
 # run: clean ${PROGRAM}
-	./${PROGRAM}
\ No newline at end of file
+	./${PROGRAM}
diff --git a/ex5/code/task_2-5/main.cpp b/ex5/code/task_2-5/main.cpp
index cebd89a..ec24e09 100644
--- a/ex5/code/task_2-5/main.cpp
+++ b/ex5/code/task_2-5/main.cpp
@@ -58,8 +58,8 @@ void task_2() {
 void task_3() {
     printf("\n\n-------------- Task 3 --------------\n\n");
     
-    int threads = 4;
-    omp_set_num_threads(threads);
+    //int threads = 4;
+    //omp_set_num_threads(threads);
     cout << omp_get_max_threads() << " threads have been started." << endl;
 
     // #####################################
@@ -207,9 +207,9 @@ void task_4() {
 }
 
 int main() {
-    task_2();
+    //task_2();
     task_3();
-    task_4();
+    //task_4();
 
     return 0;
-}
\ No newline at end of file
+}