restructure zeta/** to storage/zeta/**

storage/zeta/cpp/completed/14215.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+#include <algorithm>
+#include <numeric>
+
+using namespace std;
+
+int main() {
+    int sides[3];
+
+    for (int i = 0; i < 3; i++) {
+        cin >> sides[i];
+    }
+
+    sort(sides, sides + 3);
+
+    if (sides[2] >= sides[1] + sides[0]) {
+        sides[2] = sides[1] + sides[0] - 1;
+    }
+
+    cout << accumulate(sides, sides + 3, 0) << endl;
+    return 0;
+}