diff --git a/cpp/StftPitchShift/ETC.h b/cpp/StftPitchShift/ETC.h
index ae6a0d3..02a65ad 100755
--- a/cpp/StftPitchShift/ETC.h
+++ b/cpp/StftPitchShift/ETC.h
@@ -86,20 +86,17 @@ double cent(const std::string& value)
 
 size_t number(const std::string& value)
 {
-  if (value == "1k")
+  if (value.empty())
   {
-    return 1 * 1024;
+    return 0;
   }
-  else if (value == "2k")
-  {
-    return 2 * 1024;
-  }
-  else if (value == "4k")
-  {
-    return 4 * 1024;
-  }
-  else
+
+  if (value.back() == 'k' || value.back() == 'K')
   {
-    return std::stoi(value);
+    const size_t prefix = value.size() - 1;
+
+    return (prefix ? std::stoi(value.substr(0, prefix)) : 0) * 1024;
   }
+
+  return std::stoi(value);
 }
diff --git a/python/stftpitchshift/main.py b/python/stftpitchshift/main.py
index b56defc..42c6064 100644
--- a/python/stftpitchshift/main.py
+++ b/python/stftpitchshift/main.py
@@ -26,7 +26,7 @@ def main(input, output, pitch, quefrency, timbre, rms, window, overlap, debug):
     def semicent(value): return value.startswith('+') or value.startswith('-') or (value.startswith('0') and '.' not in value)
     def semitone(value): return pow(2, float(re.match('([+,-]?\\d+){1}([+,-]\\d+){0,1}', value)[1]) / 12)
     def cent(value):     return pow(2, float(re.match('([+,-]?\\d+){1}([+,-]\\d+){0,1}', value)[2] or 0) / 1200)
-    def number(value):   return 1*1024 if value == '1k' else 2*1024 if value == '2k' else 4*1024 if value == '4k' else int(value)
+    def number(value):   return int(value[:-1]) * 1024 if value.lower().endswith('k') else int(value)
 
     x, samplerate = read(input)