2 files changed, 4 insertions, 4 deletions
diff --git a/4/part1.c b/4/part1.c
index 7b53e3c..65c3b99 100644
--- a/4/part1.c
+++ b/4/part1.c
@@ -62,7 +62,7 @@ int count_valid_passports(const char *filename)
     return correct;
 }
 
-int main()
+int main(int argc, char *argv[])
 {
-    printf("%i", count_valid_passports("input"));
+    printf("%i", count_valid_passports(argv[1]));
 }
diff --git a/4/part2.c b/4/part2.c
index 73a4560..f132753 100644
--- a/4/part2.c
+++ b/4/part2.c
@@ -129,7 +129,7 @@ int count_valid_passports(const char *filename)
     return correct;
 }
 
-int main()
+int main(int argc, char *argv[])
 {
-    printf("%i", count_valid_passports("input"));
+    printf("%i", count_valid_passports(argv[1]));
 }