diff --git a/main.cpp b/main.cpp
index 6dca8b2..bd0e3af 100644
--- a/main.cpp
+++ b/main.cpp
@@ -13,26 +13,26 @@ struct Input {
 };
 
 Input
-input_data() {
+input_data(istream& in) {
+    Input inp;
     size_t number_count;
     cerr << "Enter number count: ";
-    cin >> number_count;
-    Input in;
-    in.numbers.resize(number_count);
+    in >> number_count;
+    inp.numbers.resize(number_count);
     cerr << "Enter numbers: " << endl;
     for (size_t i = 0; i < number_count; i++) {
-        cin >> in.numbers[i];
+        in >> inp.numbers[i];
     }
     cerr << "Enter bin count: ";
-    cin >> in.bin_count;
-    return in;
+    in >> inp.bin_count;
+    return inp;
 }
 
 
 int
 main()
 {
-    auto in = input_data();
+    auto in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;