diff --git a/main.cpp b/main.cpp
index c36fb76..3414622 100644
--- a/main.cpp
+++ b/main.cpp
@@ -11,11 +11,11 @@ struct Input
     size_t bin_count{};
 };
 
-Input input_data()
+Input input_data(istream& inx)
 {
     size_t number_count;
     cerr << "Enter number count: ";
-    cin >> number_count;
+    inx >> number_count;
 
     Input in;
     in.numbers.resize(number_count);
@@ -24,17 +24,17 @@ Input input_data()
     for (int i = 0; i < number_count; i++)
     {
         cerr << "Number[" << i << "]=";
-        cin >> in.numbers[i];
+        inx >> in.numbers[i];
     }
 
     cerr << "Enter bin count: ";
-    cin >> in.bin_count;
+    inx >> in.bin_count;
     return in;
 }
 
 int main()
 {
-    Input in = input_data();
+    auto in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
 
     double min, max;