diff --git a/25xxx/25592.cpp b/25xxx/25592.cpp
new file mode 100644
index 00000000..8da863c2
--- /dev/null
+++ b/25xxx/25592.cpp
@@ -0,0 +1,20 @@
+#include <iostream>
+using namespace std;
+
+void solve(void) {
+  int n; cin >> n;
+
+  for (int i=1; ; i++) {
+    if (n >= i*(i+1)/2) continue;
+    cout << (i & 1 ? i*(i+1)/2-n : 0);
+    return;
+  }
+}
+
+int main(void) {
+  ios::sync_with_stdio(false);
+  cin.tie(nullptr);
+
+  solve();
+  return 0;
+}
\ No newline at end of file