diff --git a/main.cpp b/main.cpp
index 45c503a..bd190b8 100644
--- a/main.cpp
+++ b/main.cpp
@@ -13,21 +13,22 @@ struct Input {
 };
 
 
- Input input_data() {
+ Input input_data(istream& inp) {
 
 
 size_t number_count;
-cerr << "Enter number count: "; cin >> number_count;
+cerr << "Enter number count: "; inp >> number_count;
 
 Input in;
 
 in.numbers.resize(number_count);
  for (size_t i = 0; i < number_count; i++) {
-        cerr << "Enter [" << i << "]: "; cin >> in.numbers[i];
+        cerr << "Enter [" << i << "]: "; inp >> in.numbers[i];
     }
 
 in.bin_count;
-cerr << "Enter bin count: "; cin >> in.bin_count;
+cerr << "Enter bin count: "; inp >> in.bin_count;
+
 
     return in;
 }
@@ -38,7 +39,7 @@ int main()
 {
 unsigned int  n;
 
-auto in = input_data();
+auto in = input_data(cin);
 double min,max;
 auto  bins = make_histogram(in.numbers, in.bin_count);