diff --git a/main.cpp b/main.cpp
index 08c7870..6670151 100644
--- a/main.cpp
+++ b/main.cpp
@@ -11,19 +11,19 @@ struct Input {
 };
 
 Input
-input_data(istream& in) {
+input_data(istream& in, bool prompt) {
     size_t number_count;
-    cerr << "Enter number count: ";
+    if (prompt) {cerr << "Enter number count: ";}
     in >> number_count;
 
     Input in1;
     in1.numbers.resize(number_count);
-    cerr << "Enter numbers: ";
+    if (prompt) {cerr << "Enter numbers: ";}
     for (size_t i = 0; i < number_count; i++) {
         in >> in1.numbers[i];
     }
 
-    cerr << "Enter bin count: ";
+    if (prompt) {cerr << "Enter bin count: ";}
     in >> in1.bin_count;
 
     return in1;
@@ -33,8 +33,9 @@ int main()
 {
     const size_t SCREEN_WIDTH = 80;
     const size_t MAX_ASTERISK = SCREEN_WIDTH - 3 - 1;
+    bool prompt = true;
 
-    auto in = input_data(cin);
+    auto in = input_data(cin, prompt);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins);
     return 0;