diff --git a/day3/day3.py b/day3/day3.py
new file mode 100644
index 0000000..7b7d0ff
--- /dev/null
+++ b/day3/day3.py
@@ -0,0 +1,67 @@
+def calculate_gamma(inp):
+    gamma_rate = [0] * len(inp[0])
+    for line in inp:
+        for index, char in enumerate(line):
+            gamma_rate[index] += int(char)
+    gamma_rate = [0 if x < len(inp) // 2 else 1 for x in gamma_rate]
+    return gamma_rate
+
+
+def part1(inp):
+    gamma = calculate_gamma(inp)
+    epsilon =  [0 if x == 1 else 1 for x in gamma]
+    # power consumption = dec(gamma_rate) * dec(epsilon_rate)
+    power = int("".join(str(x) for x in gamma), 2) * int("".join(str(x) for x in epsilon), 2)
+    print("Part 1, power consumption : ", power)
+
+
+def calculate_most_common(inp, pos):
+    sum = 0
+    for line in inp:
+        sum += int(line[pos])
+    return 0 if sum < len(inp) // 2 else 1
+
+
+def filter_oxygen(inp, pos, most_common):
+    result = []
+    for line in inp:
+        if int(line[pos]) == most_common:
+            result.append(line)
+    return result
+
+
+def oxygen_rating(inp):
+    result = inp[:]
+    for pos in range(len(inp[0])):
+        most_common = calculate_most_common(result, pos)
+        result = filter_oxygen(result, pos, most_common)
+        if len(result) == 1:
+            return result
+
+
+def co2_rating(inp):
+    result = inp[:]
+    for pos in range(len(inp[0])):
+        least_common = 1 - calculate_most_common(result, pos)
+        result = filter_oxygen(result, pos, least_common)
+        if len(result) == 1:
+            return result
+
+
+def part2(inp):
+    oxygen = oxygen_rating(inp)
+    co2 = co2_rating(inp)
+    res = int("".join(str(x) for x in oxygen), 2) * int("".join(str(x) for x in co2), 2)
+    print(f"Part 2 : {res}")
+        
+
+
+def main(input_file):
+    with open(input_file) as f:
+        entries = [x.rstrip() for x in f.readlines()]
+        part1(entries)
+        part2(entries)
+
+
+if __name__ == "__main__":
+    main("input.txt")
diff --git a/day3/input.txt b/day3/input.txt
new file mode 100644
index 0000000..6ed7c05
--- /dev/null
+++ b/day3/input.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file