diff --git a/prob4_part1.txt b/prob4_part1.txt
new file mode 100644
index 0000000..4a5ec18
--- /dev/null
+++ b/prob4_part1.txt
@@ -0,0 +1,1000 @@
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+9-9,9-95
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+65-98,11-97
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+3-50,47-50
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+66-71,72-72
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+29-30,29-31
+8-50,58-68
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+8-72,40-73
+41-76,41-53
+57-57,5-62
+20-40,19-39
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+1-64,4-97
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+21-28,4-28
+14-16,14-14
+9-24,5-25
+20-67,17-18
+66-81,67-98
+22-61,23-57
+31-67,66-67
+14-75,74-76
+12-95,13-97
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+1-74,12-75
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+74-79,78-80
+35-79,22-80
+30-89,88-89
+31-77,31-94
+73-90,89-94
+7-83,7-98
+5-98,4-6
+4-99,96-98
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+9-99,9-99
+69-75,6-68
+48-69,47-85
+7-80,6-87
+28-35,7-99
+59-60,41-59
+28-64,27-64
+5-97,1-73
+33-88,89-94
+20-98,10-98
+9-12,10-83
+11-73,74-90
+28-86,85-87
+14-56,56-90
+47-98,46-98
+11-83,82-83
+16-46,45-47
+98-98,1-98
+32-72,33-41
+3-62,2-62
+47-48,25-47
+12-46,5-46
+10-78,10-10
+18-95,4-94
+24-81,9-70
+6-98,90-97
+3-55,38-60
+55-68,55-67
+22-80,22-82
+6-70,7-7
+13-15,12-18
+54-95,38-89
+19-93,42-93
+65-92,93-97
+50-93,50-63
+50-99,50-99
+49-49,3-48
+4-54,4-54
+48-49,49-80
+1-4,3-3
+66-98,17-67
+56-70,55-93
+51-95,51-51
+64-73,37-65
+21-72,37-76
+45-73,46-73
+35-38,36-39
+17-36,17-37
+98-98,17-99
\ No newline at end of file
diff --git a/src/lib.rs b/src/lib.rs
index ea0ca37..6b038a0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,3 +1,4 @@
 pub mod prob1;
 pub mod prob2;
-pub mod prob3;
\ No newline at end of file
+pub mod prob3;
+pub mod prob4;
\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
index 638bf8e..c74fc3f 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -21,6 +21,6 @@ fn main() {
     {
         let file_path = "prob3_part2.txt";
         let max_part2 = prob3::solve_part2(file_path);
-        println!("Solution for problem 3 part 1: {max_part2}");
+        println!("Solution for problem 3 part 2: {max_part2}");
     }
 }
diff --git a/src/prob4/mod.rs b/src/prob4/mod.rs
new file mode 100644
index 0000000..e69de29