diff --git a/18xxx/18408.cpp b/18xxx/18408.cpp
new file mode 100644
index 00000000..8b77bac2
--- /dev/null
+++ b/18xxx/18408.cpp
@@ -0,0 +1,16 @@
+#include <iostream>
+using namespace std;
+
+void solve(void) {
+  int a, b, c; cin >> a >> b >> c;
+
+  cout << (a+b+c+1)/3;
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr); cout.tie(nullptr);
+
+  solve();
+  return 0;
+}
\ No newline at end of file