diff --git a/main.cpp b/main.cpp
index da1fd65..5722e73 100644
--- a/main.cpp
+++ b/main.cpp
@@ -13,34 +13,34 @@ struct Input
     vector<string> colors;
 };
 
-Input input_data()
+Input input_data(istream& inp)
 {
     Input in;
     size_t number_count;
     cerr << "Enter number_count: ";
-    cin >> number_count;
+    inp >> number_count;
 
     in.numbers.resize(number_count);
 
     for (size_t i = 0; i < number_count; i++)
     {
-        cin >> in.numbers[i];
+        inp >> in.numbers[i];
     }
 
     cerr << "Enter bin_count: ";
-    cin >> in.bin_count;
+    inp >> in.bin_count;
 
     in.colors.resize(in.bin_count);
     cerr << "Enter colors: ";
     for (size_t i = 0; i < in.bin_count; i++) {
-        cin >> in.colors[i];
+        inp >> in.colors[i];
     }
     return in;
 }
 
 int main()
 {
-    auto in = input_data();
+    auto in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins, in.colors);
     return 0;