diff --git a/chtoto.cbp b/chtoto.cbp
index e3425c8..e39e670 100644
--- a/chtoto.cbp
+++ b/chtoto.cbp
@@ -32,7 +32,13 @@
 			<Add option="-Wall" />
 			<Add option="-fexceptions" />
 		</Compiler>
+		<Unit filename="histogram.cpp" />
+		<Unit filename="histogram.h" />
 		<Unit filename="main.cpp" />
+		<Unit filename="svg.cpp" />
+		<Unit filename="svg.h" />
+		<Unit filename="text.cpp" />
+		<Unit filename="text.h" />
 		<Extensions>
 			<lib_finder disable_auto="1" />
 		</Extensions>
diff --git a/main.cpp b/main.cpp
index bc83488..aec7f45 100644
--- a/main.cpp
+++ b/main.cpp
@@ -10,25 +10,28 @@ struct Input {
     size_t bin_count{};
 };
 
-Input input_data()
+Input input_data(istream& in, bool prompt)
 {
     size_t number_count;
-    cerr << "Enter number count = ";
-    cin >> number_count;
-    Input in;
-    in.numbers.resize(number_count);
+    if (prompt)
+        cerr << "Enter number count = ";
+
+    in >> number_count;
+    Input inn;
+    inn.numbers.resize(number_count);
 
     for (size_t i = 0; i < number_count; i++)
     {
-        cin >> in.numbers[i];
+        in >> inn.numbers[i];
     }
-    cerr << "Enter bin_count = ";
-    cin >> in.bin_count;
-    return in;
+    if (prompt)
+        cerr << "Enter bin_count = ";
+    in >> inn.bin_count;
+    return inn;
 }
 
 int main() {
-    auto in = input_data();
+    auto in = input_data(cin, true);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);