diff --git a/25/12/go/3075.go b/25/12/go/3075.go
new file mode 100644
index 0000000..a08ae7b
--- /dev/null
+++ b/25/12/go/3075.go
@@ -0,0 +1,19 @@
+package A
+
+import (
+	"slices"
+)
+
+func maximumHappinessSum(happiness []int, k int) int64 {
+	ans := int64(0)
+	slices.SortFunc(happiness, func(a, b int) int {
+		return b - a
+	})
+	for i, v := range happiness {
+		if v < i || i > k-1 {
+			break
+		}
+		ans += int64(v - i)
+	}
+	return ans
+}