diff --git a/lab1/pi_mpi.c b/lab1/pi_mpi.c
index e0f3299..3774ce2 100644
--- a/lab1/pi_mpi.c
+++ b/lab1/pi_mpi.c
@@ -1,6 +1,6 @@
 #include <stdio.h>
 #include <string.h>
-#include "mpi/mpi.h"
+#include "mpi.h"
 #define N 100000000
 
 int main (int argc, char** argv)
diff --git a/lab1/pi_ser.c b/lab1/pi_ser.c
index 28ed7b5..b3676cb 100644
--- a/lab1/pi_ser.c
+++ b/lab1/pi_ser.c
@@ -23,7 +23,7 @@ int main (int argc, char** argv)
     
     for (i = 0; i < n; i ++)
     {
-        x = (i + 0.5)*h;
+        x = (i+0.5)*h;
         l_sum += 4.0/(1.0 + x*x);
     }
 
diff --git a/lab3/mpi_heat2D.c b/lab3/mpi_heat2D.c
index cb64a3f..a08c7a0 100644
--- a/lab3/mpi_heat2D.c
+++ b/lab3/mpi_heat2D.c
@@ -46,7 +46,7 @@ PARALLEL MPI VERSION :
 #include <stdio.h>
 #include <stdlib.h>
 #include <math.h>
-#include <mpi/mpi.h>
+#include <mpi.h>
 #define NN 50
 #define MM 50  
 
diff --git a/lab3/plot.py b/lab3/plot.py
index 09e9d81..231e799 100755
--- a/lab3/plot.py
+++ b/lab3/plot.py
@@ -14,5 +14,5 @@ A = [ map(float,line.split()) for line in f ]
 
 figure(1)
 imshow(A, interpolation='nearest')
-grid(True)
+#grid(True)
 show()
diff --git a/lab3/ser_heat2D.c b/lab3/ser_heat2D.c
index 23637d5..3cf927c 100644
--- a/lab3/ser_heat2D.c
+++ b/lab3/ser_heat2D.c
@@ -23,7 +23,7 @@ Interrior point :
   u[Central] = (1/4) * ( u[North] + u[South] + u[East] + u[West] )
 
  ****************************************************************************/
-#include <stdio.h>
+#include <stdio.h> 
 #include <stdlib.h>
 #include <math.h>
 
@@ -102,7 +102,7 @@ int main(int argc, char *argv[])
     
         if(iter%ITER_PRINT==0)
      
-            printf("Iteration %d, diff = %f\n ", iter,diff);
+            printf("Iteration %d, diff = %e\n ", iter,diff);
 
         iter++;
     }
@@ -185,7 +185,7 @@ void inidat(int nx, int ny, float *u, float *unew)
 
     //boundary top
      for (iy = 0; iy < ny; iy++){ 
-        u[iy]=0.0; 
+        u[iy]=100.0; 
 
     }