diff --git a/main.cpp b/main.cpp
index 06aa245..07fc4c4 100644
--- a/main.cpp
+++ b/main.cpp
@@ -13,16 +13,19 @@ struct Input {
 };
 
 Input
-input_data(istream& in) {
+input_data(istream& in, bool prompt) {
     Input local;
 
     size_t number_count;
     size_t bin_count;
 
-    cerr << "Enter number count: ";
+    if (prompt) {
+        cerr << "Enter number count: ";
+    }
     in >> local.number_count;
-
-    cerr << "Enter bin count: ";
+    if (prompt) {
+        cerr << "Enter bin count: ";
+    }
     in >> local.bin_count;
 
     local.numbers.resize(local.number_count);
@@ -39,7 +42,7 @@ int main() {
     std::string fill = "red";
     std::string stroke = "#000000";
 
-    auto in = input_data(cin);
+    auto in = input_data(cin, true);
     auto bins = make_histogram(in.numbers, in.bin_count);
     show_histogram_svg(bins, fill, stroke);
     return 0;