diff --git a/src/10/20/P4087.cpp b/src/10/20/P4087.cpp
index 0160678..d5f0fc2 100644
--- a/src/10/20/P4087.cpp
+++ b/src/10/20/P4087.cpp
@@ -32,10 +32,9 @@ int main() {
     for (ll i = 1; i <= n; i++) {
 
         ll max_num_before = num_cowcount.rbegin()->first;
-        bool just_one_was_max = num_cowcount.rbegin()->second==1;
 
         ll old_cownum = cow_num[c[i].c];
-
+        ll wasmaxcnt = num_cowcount[old_cownum];
         bool was_top = (old_cownum == max_num_before);
 
         num_cowcount[old_cownum]--;
@@ -47,12 +46,12 @@ int main() {
         cow_num[c[i].c] = new_cownum;
 
         num_cowcount[new_cownum]++;
-
+        ll ismaxcnt = num_cowcount[new_cownum];
         ll max_num_after = num_cowcount.rbegin()->first;
 
         bool is_top = (new_cownum == max_num_after);
 
-        if ((max_num_before != max_num_after && !just_one_was_max) || (was_top != is_top)) {
+        if ((was_top != is_top)||(was_top&is_top && wasmaxcnt!=ismaxcnt)) {
             ans++;
         }
     }