diff --git a/ex00/Main.cpp b/ex00/Main.cpp
index bf678b8..9a7857a 100644
--- a/ex00/Main.cpp
+++ b/ex00/Main.cpp
@@ -10,6 +10,5 @@ int main(int argc, char **argv)
 	BitcoinExchange btc;
 	btc.loadDatabase("data.csv");
 	btc.processInput(argv[1]);
-	std::cout << btc.isValidDate("2000-02-29") << std::endl;
 	return (0);
 }
diff --git a/ex00/Makefile b/ex00/Makefile
index b31ee8e..0fb259b 100644
--- a/ex00/Makefile
+++ b/ex00/Makefile
@@ -1,9 +1,9 @@
 CXX = c++
 CXXFLAGS = -Wall -Wextra -Werror -std=c++98
 OBJDIR = obj
-SOURCES = Main.cpp BitcoinExchange.cpp 
+SOURCES = Main.cpp BitcoinExchange.cpp
 OBJECTS = $(addprefix $(OBJDIR)/, $(SOURCES:.cpp=.o))
-NAME = btc
+NAME = btv
 
 all: $(NAME)
 
diff --git a/ex00/btc b/ex00/btc
deleted file mode 100755
index 5d703c9..0000000
Binary files a/ex00/btc and /dev/null differ
diff --git a/ex00/btv b/ex00/btv
new file mode 100755
index 0000000..6b35e40
Binary files /dev/null and b/ex00/btv differ
diff --git a/ex00/obj/Main.o b/ex00/obj/Main.o
index 8de3843..f50abfb 100644
Binary files a/ex00/obj/Main.o and b/ex00/obj/Main.o differ
diff --git a/ex00/output.txt b/ex00/output.txt
deleted file mode 100644
index 404aae1..0000000
--- a/ex00/output.txt
+++ /dev/null
@@ -1,2 +0,0 @@
-dsd
-2000-02-29 | 1
diff --git a/ex01/Main.cpp b/ex01/Main.cpp
new file mode 100644
index 0000000..b5ef2fe
--- /dev/null
+++ b/ex01/Main.cpp
@@ -0,0 +1,21 @@
+#include "RPN.hpp"
+
+int main(int ac, char **av)
+{
+	if (ac == 2)
+	{
+		RPN rpn;
+		try
+		{
+			std::cout << rpn.compute(av[1]) << std::endl;
+		}
+		catch(const std::exception& e)
+		{
+			std::cerr << e.what() << '\n';
+		}
+		return 0;
+	}
+	std::cerr << "Error" << std::endl;
+	return 1;
+
+}
diff --git a/ex01/Makefile b/ex01/Makefile
new file mode 100644
index 0000000..fc149a7
--- /dev/null
+++ b/ex01/Makefile
@@ -0,0 +1,36 @@
+CXX = c++
+CXXFLAGS = -Wall -Wextra -Werror -std=c++98
+OBJDIR = obj
+SOURCES = Main.cpp RPN.cpp
+OBJECTS = $(addprefix $(OBJDIR)/, $(SOURCES:.cpp=.o))
+NAME = RPN
+
+all: $(NAME)
+
+$(OBJDIR):
+	@echo "📁 Creating obj directory..."
+	@mkdir -p $(OBJDIR)
+
+$(OBJDIR)/%.o: %.cpp | $(OBJDIR)
+	@echo "🧠 Compiling $< ..."
+	@$(CXX) $(CXXFLAGS) -c $< -o $@
+	@echo "✅ $@ ready!"
+
+$(NAME): $(OBJECTS)
+	@echo "🔗 Linking $(NAME) ..."
+	@$(CXX) $(CXXFLAGS) $(OBJECTS) -o $(NAME)
+	@echo "🎉 $(NAME) is ready!"
+
+clean:
+	@echo "🧹 Cleaning object files..."
+	@rm -rf $(OBJDIR)
+	@echo "✨ Objects cleaned!"
+
+fclean: clean
+	@echo "🗑️  Removing $(NAME)..."
+	@rm -f $(NAME)
+	@echo "💀 Full clean complete!"
+
+re: fclean all
+
+.PHONY: all clean fclean re
diff --git a/ex01/RPN.cpp b/ex01/RPN.cpp
new file mode 100644
index 0000000..2ca7a63
--- /dev/null
+++ b/ex01/RPN.cpp
@@ -0,0 +1,66 @@
+#include "RPN.hpp"
+
+RPN::RPN(){}
+
+RPN::RPN(const RPN &other)
+{
+	this->_stack = other._stack;
+}
+
+RPN &RPN::operator=(const RPN &other)
+{
+	this->_stack = other._stack;
+	return (*this);
+}
+
+RPN::~RPN(){}
+
+int RPN::compute(const std::string &string)
+{
+	std::istringstream iss(string);
+	std::string token;
+	std::string ops = "+-*/";
+	int b;
+	int a;
+	while (iss >> token)
+	{
+		if (token.size() == 1)
+		{
+			if (isdigit(token[0]))
+				_stack.push(token[0] - '0');
+			else if (ops.find(token[0]) != std::string::npos)
+			{
+				if (_stack.size() <= 1)
+					throw std::runtime_error("Error");
+				b = _stack.top();
+				_stack.pop();
+				a = _stack.top();
+				_stack.pop();
+				switch (token[0])
+				{
+				case '+':
+					_stack.push(a + b);
+					break;
+				case '-':
+					_stack.push(a - b);
+					break;
+				case '*':
+					_stack.push(a * b);
+					break;
+				case '/':
+					if (b == 0)
+						throw std::runtime_error("Error");
+					_stack.push(a / b);
+					break;
+				}
+			}
+			else
+				throw std::runtime_error("Error");
+		}
+		else
+			throw std::runtime_error("Error");
+	}
+	if (_stack.size() != 1)
+		throw std::runtime_error("Error");
+	return _stack.top();
+}
diff --git a/ex01/RPN.hpp b/ex01/RPN.hpp
new file mode 100644
index 0000000..9037b7c
--- /dev/null
+++ b/ex01/RPN.hpp
@@ -0,0 +1,23 @@
+#ifndef RPN_HPP
+# define RPN_HPP
+
+#include <iostream>
+#include <sstream>
+#include <stack>
+#include <string>
+
+class RPN
+{
+    public:
+        RPN();
+        RPN(const RPN &other);
+        RPN &operator=(const RPN &other);
+        ~RPN();
+
+        int compute(const std::string &string);
+
+    private:
+        std::stack<int> _stack;
+};
+
+#endif
diff --git a/test.c b/test.c
deleted file mode 100644
index e878e68..0000000
--- a/test.c
+++ /dev/null
@@ -1,13 +0,0 @@
-#include <stdio.h>
-#include <stdlib.h>
-
-int main(int ac, char **av)
-{
-	int month;
-	int days;
-	if (ac == 2) {
-		month = atoi(av[1]);
-		days = 30 + (month + month / 8) % 2;
-		printf("Nombre de jour : %d", days);
-	}
-}