diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 69a451e..893e657 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -12,7 +12,7 @@
                 "${workspaceFolder}\\build\\build.exe"
             ],
             "options": {
-                "cwd": "${fileDirname}"
+                "cwd": "${workspaceFolder}\\build\\"
             },
             "problemMatcher": [
                 "$gcc"
diff --git a/src/calculator.cpp b/src/calculator.cpp
index c7cda3c..cc435d8 100644
--- a/src/calculator.cpp
+++ b/src/calculator.cpp
@@ -145,12 +145,11 @@ void correctNegativeSign(parseResult* _input) {
     for (auto it = parsed->begin(); it != parsed->end(); it++) {
         auto jt = it + 1; //next element
         if (it->type == SymbolType::subract && jt != parsed->end() && jt->type == SymbolType::number) {
-            it = parsed->erase(it);
-            it->value = it->value * (-1);
+            it->type = SymbolType::add;
+            jt->value = jt->value * (-1);
             continue;
         }
     }
-    parsed->shrink_to_fit();
 }
 
 /**
@@ -162,6 +161,8 @@ void correctNegativeSign(parseResult* _input) {
  */
 bool validateParsation(const std::vector<Symbol>* _input) {
     return true;
+
+    // FIXME: It's broken somewhere
     if (_input->size() == 0) return false;
     for (auto it = _input->begin(); true /* Break argument 2 lines down */; it++) {
         auto jt = it + 1;
@@ -311,11 +312,8 @@ Symbol calculateUsingStack(std::vector<Symbol>& _stack) {
             return toPut;
         } break;
         case SymbolType::subract: {
-            Stack::take<Symbol>(_stack); //top symbol...
-            Symbol toPut;
-            toPut.value = calculateUsingStack(_stack).value - calculateUsingStack(_stack).value;
-            Stack::put<Symbol>(_stack, toPut);
-            return toPut;
+            //subtract is unnecessary because it's already converted to addition in previous step.
+            throw "impossible";
         } break;
         case SymbolType::multiply: {
             Stack::take<Symbol>(_stack); //top symbol...
diff --git a/src/main.cpp b/src/main.cpp
index 19be4e4..ca17c19 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -139,7 +139,7 @@ int main() {
                 terminal::key_right(keys);
                 break;
             default:
-                debugKey(input, debugOffset);
+                // debugKey(input, debugOffset);
                 break;
             }
             continue;
@@ -176,7 +176,7 @@ int main() {
             exit |= commands::loop();
             break;
         default:
-            debugKey(input, debugOffset);
+            // debugKey(input, debugOffset);
             break;
         };
     }
diff --git a/zadanie.txt b/zadanie.txt
index 15b585a..7004a2f 100644
--- a/zadanie.txt
+++ b/zadanie.txt
@@ -28,6 +28,7 @@ Poziom dokumentacji: 3 stopniowa (wymagania, instrukcja z zrzutami ekranu, kod p
 Format instrukcji: A4
 Format zapisu instrukcji: PDF
 Format pliku do upload'u: ZIP (bez hasła)
+Nazwa pliku zip: R1IS_Prog.CPP_projekt_<nazwisko><imie>.zip
 Czcionka kodu programu: KONSOLOWA
 Wymagana wersja źródłowa kodu: TAK
 Wymagana wersja wykonywalna kodu: TAK