diff --git a/2025/3.txt b/2025/3.txt
index e69de29..7255fca 100644
--- a/2025/3.txt
+++ b/2025/3.txt
@@ -0,0 +1,4 @@
+987654321111111
+811111111111119
+234234234234278
+818181911112111
diff --git a/2025/aoc b/2025/aoc
index cdae1cc..63b062f 100755
Binary files a/2025/aoc and b/2025/aoc differ
diff --git a/2025/day3.hpp b/2025/day3.hpp
index 3200649..58d5530 100644
--- a/2025/day3.hpp
+++ b/2025/day3.hpp
@@ -11,7 +11,45 @@ public:
 
     uint64_t PartOne(File& f) override
     {
+        uint64_t totalJoltage = 0;
 
+        for (auto bank : f.Lines())
+        {
+            int joltage = 0;
+            // find biggest (can't be last)
+            int biggest = 0;
+            int biggestIndex = 0;
+            for (int i = 0; i < bank.length() - 1; i++)
+            {
+                if (bank[i] - '0' > biggest)
+                {
+                    biggest = bank[i] - '0';
+                    biggestIndex = i + 1;
+                }
+            }
+
+            joltage = biggest;
+            joltage *= 10;
+
+            std::cout << biggest;
+            biggest = 0;
+
+
+            for (int i = biggestIndex; i < bank.length(); i++)
+            {
+                if (bank[i] - '0' > biggest)
+                {
+                    biggest = bank[i] - '0';
+                }
+            }
+            std::cout << biggest << std::endl;
+
+            joltage += biggest;
+
+            totalJoltage += joltage;
+        }
+
+        return totalJoltage;
     }
 
     uint64_t PartTwo(File& f) override