diff --git a/main.cpp b/main.cpp
index 5759bc4..06aa245 100644
--- a/main.cpp
+++ b/main.cpp
@@ -13,24 +13,25 @@ struct Input {
 };
 
 Input
-input_data() {
-    Input in;
+input_data(istream& in) {
+    Input local;
 
     size_t number_count;
     size_t bin_count;
 
     cerr << "Enter number count: ";
-    cin >> in.number_count;
+    in >> local.number_count;
+
     cerr << "Enter bin count: ";
-    cin >> in.bin_count;
+    in >> local.bin_count;
 
-    in.numbers.resize(in.number_count);
+    local.numbers.resize(local.number_count);
 
-    for (size_t i = 0; i < in.number_count; i++) {
-        cin >> in.numbers[i];
+    for (size_t i = 0; i < local.number_count; i++) {
+        in >> local.numbers[i];
     }
 
-    return in;
+    return local;
 };
 
 int main() {
@@ -38,7 +39,7 @@ int main() {
     std::string fill = "red";
     std::string stroke = "#000000";
 
-    auto in = input_data();
+    auto in = input_data(cin);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins, fill, stroke);
     return 0;