diff --git a/cs677/hw5/hw.tex b/cs677/hw5/hw.tex
index 8a7ad08..0e434c0 100644
--- a/cs677/hw5/hw.tex
+++ b/cs677/hw5/hw.tex
@@ -48,6 +48,21 @@
     $$ S_G = p + (1 - p) T_s = 8 + (1 - 8) \frac{1}{24} = 7.708 $$
 }
 
+\item[5.]{
+    Output from instrumented Floyd program: \\
+\texttt{
+\$ ./floyd-sequential adjacency.dat \\
+Serial execution time: 0.0248399 seconds \\
+Parallel execution time: 2.01773 seconds
+        }
+
+    This means that the percent of sequential code is roughly 1.23\%
+        (for a problem size of $n = 400$).
+    Using Amdahl's law, the maximum speedup that can be achieved with
+        this program (for this problem size) is given by
+    $$ S_{\textrm{max}} = \frac{1}{1.23\%} = 81.25 $$
+}
+
 \end{enumerate}
 
 \end{document}
diff --git a/cs677/hw5/src/floyd-sequential.cc b/cs677/hw5/src/floyd-sequential.cc
index 4bc862f..df8b877 100644
--- a/cs677/hw5/src/floyd-sequential.cc
+++ b/cs677/hw5/src/floyd-sequential.cc
@@ -1,8 +1,9 @@
 
 /* Josh Holtrop
- * 2008-10-15
+ * 2008-11-05
  * CS 677
  * Grand Valley State University
+ * Instrumented to get serial vs. parallel run times
  */
 
 #include <omp.h>
@@ -28,6 +29,10 @@ void usage(char * progname)
 
 int main(int argc, char * argv[])
 {
+    struct timeval start_time, switch_time, end_time;
+
+    gettimeofday(&start_time, NULL);        /* Start timing */
+
     if (argc < 1)
         usage(argv[0]);
 
@@ -37,8 +42,7 @@ int main(int argc, char * argv[])
     int D[2][num_verts][num_verts];
     convertToMatrix(v, num_verts, (int *) &D[0]);
 
-    struct timeval before, after;
-    gettimeofday(&before, NULL);        /* Start timing */
+    gettimeofday(&switch_time, NULL);        /* Start timing */
 
     /* Run Floyd's Algorithm on D */
     for (int k = 1; k <= num_verts; k++)
@@ -62,7 +66,7 @@ int main(int argc, char * argv[])
         }
     }
 
-    gettimeofday(&after, NULL);         /* Stop timing */
+    gettimeofday(&end_time, NULL);         /* Stop timing */
 
 #ifdef PRINT_RESULT
     cout << "Result:" << endl;
@@ -80,10 +84,13 @@ int main(int argc, char * argv[])
     }
 #endif
 
-    double time_before = before.tv_sec + before.tv_usec / 1000000.0;
-    double time_after = after.tv_sec + after.tv_usec / 1000000.0;
-    double diff = time_after - time_before;
-    cout << "Elapsed time: " << diff << " seconds." << endl;
+    double time_start = start_time.tv_sec + start_time.tv_usec / 1000000.0;
+    double time_switch = switch_time.tv_sec + switch_time.tv_usec / 1000000.0;
+    double time_end = end_time.tv_sec + end_time.tv_usec / 1000000.0;
+    double serial = time_switch - time_start;
+    double parallel = time_end - time_switch;
+    cout << "Serial execution time: " << serial << " seconds" << endl;
+    cout << "Parallel execution time: " << parallel << " seconds" << endl;
 
     return 0;
 }