diff --git a/main.cpp b/main.cpp
index e0aec15..5f45c7d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -9,22 +9,22 @@ struct Input {
     size_t bin_count{};
 };
 Input
-input_data(){
+input_data(istream& in) {
     size_t number_count;
     cerr << "Number_count: ";
-    cin >> number_count;
-    Input in;
-    in.numbers.resize(number_count);
+    in >> number_count;
+    Input im;
+    im.numbers.resize(number_count);
     for (size_t i = 0; i < number_count; i++) {
-        cin >> in.numbers[i];
+        in >> im.numbers[i];
     }
     cerr << "Enter bin_count: ";
-    cin >> in.bin_count;
-    return in;
+    in >> im.bin_count;
+    return im;
 }
 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;