diff --git a/2024/07.cpp b/2024/07.cpp
index 83c1e74..c119423 100644
--- a/2024/07.cpp
+++ b/2024/07.cpp
@@ -12,7 +12,7 @@ namespace qi = boost::spirit::qi;
 
 namespace {
 
-auto suffixed(std::uint64_t x, std::uint64_t y) -> std::optional<std::uint64_t>
+auto drop_suffix(std::uint64_t x, std::uint64_t y) -> std::optional<std::uint64_t>
 {
   while (x > 0) {
     if (y == 0) { return x; }
@@ -23,7 +23,7 @@ auto suffixed(std::uint64_t x, std::uint64_t y) -> std::optional<std::uint64_t>
   return std::nullopt;
 }
 
-auto check(bool const part2, std::uint64_t const target, std::vector<std::uint64_t> const& numbers) -> bool
+auto calibrated(bool const part2, std::uint64_t const target, std::vector<std::uint64_t> const& numbers) -> bool
 {
   if (numbers.size() == 0) { return false; }
 
@@ -41,7 +41,7 @@ auto check(bool const part2, std::uint64_t const target, std::vector<std::uint64
       if (x < t) { work.emplace(i - 1, t - x); }
       if (t % x == 0) { work.emplace(i - 1, t / x); }
       if (part2) {
-        if (auto const u = suffixed(t, x)) {
+        if (auto const u = drop_suffix(t, x)) {
           work.emplace(i - 1, *u);
         }
       }
@@ -60,10 +60,10 @@ auto Main(std::istream & in, std::ostream & out) -> void
       <std::vector<boost::tuple<std::uint64_t, std::vector<std::uint64_t>>>>
       (in, *(qi::ulong_long >> ':' >> *(' ' >> qi::ulong_long) >> '\n'));
 
-  std::uint64_t p1{}, p2{};
+  std::uint64_t p1 = 0, p2 = 0;
   for (auto && [x, xs] : input) {
-    if (check(false, x, xs)) p1 += x;
-    if (check(true,  x, xs)) p2 += x;
+    if (calibrated(false, x, xs)) p1 += x;
+    if (calibrated(true,  x, xs)) p2 += x;
   }
 
   out << "Part 1: " << p1 << "\n"