diff --git a/main.cpp b/main.cpp
index 5f90686..0b83357 100644
--- a/main.cpp
+++ b/main.cpp
@@ -39,18 +39,23 @@ void find_minmax(const vector<double>& numbers, double& min, double& max) {
     }
 }
 
-int main() {
-    auto in = input_data();
-
+vector<size_t> make_histogram(const vector<double>& numbers, size_t bin_count) {
     double min, max;
-    find_minmax(in.numbers, min, max);
+    find_minmax(numbers, min, max);
 
-    vector<size_t> bins(in.bin_count);
-    for (double x : in.numbers) {
-        size_t bin_index = (x - min) / (max - min) * in.bin_count;
-        if (bin_index == in.bin_count) bin_index--;
+    vector<size_t> bins(bin_count);
+    for (double x : numbers) {
+        size_t bin_index = (x - min) / (max - min) * bin_count;
+        if (bin_index == bin_count) bin_index--;
         bins[bin_index]++;
     }
+    return bins;
+}
+
+int main() {
+    auto in = input_data();
+
+    auto bins = make_histogram(in.numbers, in.bin_count);
 
     const size_t SCREEN_WIDTH = 80;
     size_t max_count = 0;