cache

diff --git a/src/main/java/br/ufrgs/inf/prosoft/cache/tools/Distinct.java b/src/main/java/br/ufrgs/inf/prosoft/cache/tools/Distinct.java
index c244369..40dc980 100644
--- a/src/main/java/br/ufrgs/inf/prosoft/cache/tools/Distinct.java
+++ b/src/main/java/br/ufrgs/inf/prosoft/cache/tools/Distinct.java
@@ -47,7 +47,7 @@ public class Distinct {
                     if (previous == null) {
                         previous = new HashMap<>();
                     }
-                    previous.merge(parameters, 1, (innerPrevious, innerBase) -> innerPrevious + innerBase);
+                    previous.merge(parameters, 1, Integer::sum);
                     return previous;
                 });
             });