diff --git a/day1/input.txt b/day1/input.txt
new file mode 100644
index 0000000..462aafb
--- /dev/null
+++ b/day1/input.txt
@@ -0,0 +1,100 @@
+101005
+139223
+112833
+70247
+131775
+106730
+118388
+138683
+80439
+71060
+120862
+67201
+70617
+79783
+114813
+77907
+78814
+107515
+113507
+81865
+88130
+75120
+66588
+56023
+98080
+128472
+96031
+118960
+54069
+112000
+62979
+105518
+73342
+52270
+128841
+68267
+70789
+94792
+100738
+102331
+83082
+77124
+97360
+86165
+66120
+139042
+50390
+105308
+94607
+58225
+77894
+118906
+127277
+101446
+58897
+93876
+53312
+117154
+77448
+62041
+99069
+87375
+134854
+108561
+126406
+53809
+90760
+121650
+79573
+134734
+148021
+84263
+54390
+132706
+148794
+67302
+146885
+76108
+76270
+54548
+146920
+145282
+129509
+144139
+141713
+62547
+149898
+96746
+83583
+107758
+63912
+142036
+112281
+91775
+75809
+82250
+144667
+140140
+98276
+103479
\ No newline at end of file
diff --git a/day1/main.go b/day1/main.go
new file mode 100644
index 0000000..efb90a4
--- /dev/null
+++ b/day1/main.go
@@ -0,0 +1,54 @@
+package main
+
+import (
+	"bufio"
+	"log"
+	"os"
+	"strconv"
+)
+
+func main() {
+	file, err := os.Open("input.txt")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	completeFuel := 0
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		txt := scanner.Text()
+		convert, err := strconv.ParseFloat(txt, 64)
+
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		completeFuel += CalcFuelRecusive(convert)
+	}
+
+	if err := scanner.Err(); err != nil {
+		log.Fatal(err)
+	}
+
+	log.Println(completeFuel)
+}
+
+func CalcFuelRecusive(mass float64) int {
+	sum := 0
+	for mass > 0 {
+		fuel := CalcRequiredFuel(mass)
+
+		if fuel > 0 {
+			sum += fuel
+		}
+		mass = float64(fuel)
+	}
+	return sum
+}
+
+func CalcRequiredFuel(mass float64) int {
+	fuel := mass / 3
+	return int(fuel) - 2
+}
diff --git a/day1/main_test.go b/day1/main_test.go
new file mode 100644
index 0000000..ad82031
--- /dev/null
+++ b/day1/main_test.go
@@ -0,0 +1,52 @@
+package main
+
+import "testing"
+
+func TestCalcRequiredFuel1(t *testing.T) {
+	total := CalcRequiredFuel(12)
+	if total != 2 {
+		t.Errorf("CalcRequiredFuel was incorrect, got: %d, want: %d.", total, 2)
+	}
+}
+
+func TestCalcRequiredFuel2(t *testing.T) {
+	total := CalcRequiredFuel(14)
+	if total != 2 {
+		t.Errorf("CalcRequiredFuel was incorrect, got: %d, want: %d.", total, 2)
+	}
+}
+
+func TestCalcRequiredFuel3(t *testing.T) {
+	total := CalcRequiredFuel(1968)
+	if total != 654 {
+		t.Errorf("CalcRequiredFuel was incorrect, got: %d, want: %d.", total, 654)
+	}
+}
+
+func TestCalcRequiredFuel4(t *testing.T) {
+	total := CalcRequiredFuel(100756)
+	if total != 33583 {
+		t.Errorf("CalcRequiredFuel was incorrect, got: %d, want: %d.", total, 33583)
+	}
+}
+
+func TestCalcFuelRecusive1(t *testing.T) {
+	total := CalcFuelRecusive(14)
+	if total != 2 {
+		t.Errorf("CalcRequiredFuel was incorrect, got: %d, want: %d.", total, 2)
+	}
+}
+
+func TestCalcFuelRecusive2(t *testing.T) {
+	total := CalcFuelRecusive(100756)
+	if total != 50346 {
+		t.Errorf("CalcRequiredFuel was incorrect, got: %d, want: %d.", total, 50346)
+	}
+}
+
+func TestCalcFuelRecusive3(t *testing.T) {
+	total := CalcFuelRecusive(1969)
+	if total != 966 {
+		t.Errorf("CalcRequiredFuel was incorrect, got: %d, want: %d.", total, 966)
+	}
+}