diff --git a/book.pdf b/book.pdf
index ba87e23..34067a3 100644
Binary files a/book.pdf and b/book.pdf differ
diff --git a/chapter07.tex b/chapter07.tex
index 7032f21..70fd873 100644
--- a/chapter07.tex
+++ b/chapter07.tex
@@ -356,7 +356,7 @@ for $0 \le x \le n$:
 
 \begin{lstlisting}
 count[0] = 1;
-for (int x = 1; x <= n; i++) {
+for (int x = 1; x <= n; x++) {
     for (auto c : coins) {
         if (x-c >= 0) {
             count[x] += count[x-c];