diff --git a/l03.cpp b/l03.cpp
index c9871d9..8794733 100644
--- a/l03.cpp
+++ b/l03.cpp
@@ -37,7 +37,6 @@ Input input_data()
 
     return in;
 }
-using namespace std;
 
 void find_minmax(const vector<double> &numbers, double &min, double &max)
 {
@@ -57,6 +56,46 @@ void find_minmax(const vector<double> &numbers, double &min, double &max)
     }
 }
 
+int make_histogram(const vector<double> &numbers, size_t &bin_count)
+{
+     vector<int> bins(bin_count);
+    int max_count = bins[0];
+    double min = numbers[0];
+    double max = numbers[0];
+
+    find_minmax(numbers, min, max);
+    double bin_size = (max - min) / bin_count;
+
+    for (size_t i = 0; i < numbers.size(); i++)
+    {
+        bool found = false;
+        for (size_t j = 0; (j < bin_count - 1) && !found; j++)
+        {
+            auto lo = min + j * bin_size;
+            auto hi = min + (j + 1) * bin_size;
+
+            if ((lo <= numbers[i]) && (numbers[i] < hi))
+            {
+                bins[j]++;
+                found = true;
+            }
+        }
+
+        if (!found)
+        {
+            bins[bin_count - 1]++;
+        }
+    }
+    for (int i = 0; i < bin_count; i++)
+    {
+        if (bins[i] > max_count)
+        {
+            max_count = bins[i];
+        }
+    }
+    return bins;
+}
+
 int main()
 {
     Input in = input_data();