diff --git a/func_sum.cpp b/func_sum.cpp
index dd3a39e..57c0c04 100644
--- a/func_sum.cpp
+++ b/func_sum.cpp
@@ -1,16 +1,20 @@
 #include <iostream>
-#include <array>
+#include <numeric>
 using namespace std;
-using std::cout;
-using std::array;
 
-int prices[] = {40,30,50};
-int adding(int x[]) {
-    int to_pay = 0;
-    for (int i = 0; i<sizeof(x) ; i++) {
-        to_pay += x[i];
-    }
-    return to_pay;  
-}
+int main() {
+  int prices[] = {40,30,50};
+
+// int adding(int x[]) {
+//     int to_pay = 0;
+//     for (int i = 0; i<sizeof(x) ; i++) {
+//         to_pay += x[i];
+//     }
+//     return to_pay;  
+// }
 
-cout << adding(prices[]);
+// using accumulate, we may calc. a sum of an array
+int total = accumulate(begin(prices), end(prices), 0, plus<int>());
+
+cout << total;
+}