diff --git a/day01.cpp b/day01.cpp
index 624630d..c1131ac 100644
--- a/day01.cpp
+++ b/day01.cpp
@@ -1,28 +1,21 @@
 #include <algorithm>
-#include <numeric>
-#include <cstdlib>
 #include <cstdint>
 #include <iostream>
 #include <fstream>
 #include <iterator>
 #include <vector>
-#include <string>
 
 #include <aocpp/Startup.hpp>
 
 auto main(int argc, char** argv) -> int {
   auto fin = aocpp::Startup(argc, argv);
-  std::vector<std::int64_t> input;
-  std::copy(std::istream_iterator<std::int64_t>{fin},
-            std::istream_iterator<std::int64_t>{},
-            std::back_inserter(input));
-
   auto fuel = [](std::int64_t& x) { return x=x/3-2; };
 
+  std::int64_t x;
   std::int64_t part1 = 0;
   std::int64_t part2 = 0;
 
-  for (auto x : input) {
+  while (fin >> x) {
     part1 += fuel(x);
     for (; x > 0; fuel(x)) {
       part2 += x;