diff --git a/data.py b/data.py
index c7fd59b..1471e1f 100644
--- a/data.py
+++ b/data.py
@@ -159,6 +159,7 @@ class Report:
     def __init__(self, data, pdate):
         self._data = data
         self._date = pdate
+        self._actual_data_len = 0
 
     def report(self):
         tmp = []
@@ -173,14 +174,18 @@ class Report:
             tmp.append(("End", datetime.now()))
 
         ret = []
-        dsum = timedelta()
+        tasks_sums = {}
+        total_sum = timedelta()
         for i, t in enumerate(tmp):
             task, start_time = t
             if i < len(tmp) - 1:
                 end_time = tmp[i+1][1]
                 duration = end_time - start_time
                 if task != "Pause":
-                    dsum += duration
+                    task_sum = tasks_sums.setdefault(task, timedelta())
+                    task_sum += duration
+                    tasks_sums[task] = task_sum
+                    total_sum += duration
                 dhours, rem = divmod(duration.seconds, 3600)
                 dmins, _ = divmod(rem, 60)
                 ret.append([task, start_time.strftime("%H:%M"), f"{dhours:02d}:{dmins:02d}"])
@@ -188,16 +193,22 @@ class Report:
                 ret.append([task, start_time.strftime("%H:%M"), ""])
 
         ret.append(["", "", ""])
-        dhours, rem = divmod(dsum.seconds, 3600)
+        ret.append(["", "Sums", ""])
+        for k, v in tasks_sums.items():
+            dhours, rem = divmod(v.seconds, 3600)
+            dmins, _ = divmod(rem, 60)
+            ret.append([k, "", f"{dhours:02d}:{dmins:02d}"])
+        dhours, rem = divmod(total_sum.seconds, 3600)
         dmins, _ = divmod(rem, 60)
-        ret.append(["Sum", "", f"{dhours:02d}:{dmins:02d}"])
-        return ret
+        ret.append(["Total sum", "", f"{dhours:02d}:{dmins:02d}"])
+        edit_len = len(ret) - (4 + len(tasks_sums))
+        self._actual_data_len = edit_len
+        if self._date != date.today():
+            self._actual_data_len += 1
+        return ret, edit_len
 
     def save(self, report):
-        if self._date == date.today():
-            report = report[:-3]  # cut off sum display and end time
-        else:
-            report = report[:-2]  # cut off sum display
+        report = report[:self._actual_data_len]
         if not report:
             return
         save_list = []
diff --git a/report.py b/report.py
index 740f509..d6aabfe 100644
--- a/report.py
+++ b/report.py
@@ -72,7 +72,7 @@ class Report(QtWidgets.QDialog):
         self.setWindowTitle(f"Report {self._report.date()}")
 
     def refresh_table(self):
-        self._report_data = self._report.report()
+        self._report_data, edit_len = self._report.report()
         self.tableWidget.setRowCount(len(self._report_data))
 
         self._changing_items = True
@@ -84,10 +84,10 @@ class Report(QtWidgets.QDialog):
             item2 = QtWidgets.QTableWidgetItem(self._report_data[row][2])
             self.tableWidget.setItem(row, 2, item2)
             item2.setFlags(item2.flags() & QtCore.Qt.ItemIsEnabled)
-            if row > len(self._report_data) - 3:
-                item1.setFlags(item1.flags() & QtCore.Qt.ItemIsEnabled)
-            if row > len(self._report_data) - 4:
-                item0.setFlags(item0.flags() & QtCore.Qt.ItemIsEnabled)
+            if row >= edit_len:
+                item0.setFlags(item1.flags() & QtCore.Qt.ItemIsEnabled)
+            if row > edit_len:
+                item1.setFlags(item0.flags() & QtCore.Qt.ItemIsEnabled)
         self._changing_items = False
 
         self.tableWidget.resizeColumnsToContents()