diff --git a/src/preprocessed_text.py b/src/preprocessed_text.py
index 632066a..2529d76 100644
--- a/src/preprocessed_text.py
+++ b/src/preprocessed_text.py
@@ -359,9 +359,12 @@ def form(text):
 
 ######################################################################
 def add_operators(text):
-  re_incr = re.compile(r"(\s*)(.*)(\+=)(.*$)",re.S)
-  re_decr = re.compile(r"(\s*)(.*)(-=)(.*$)",re.S)
-  re_mult = re.compile(r"(\s*)(.*)(\*=)(.*$)",re.S)
+  re_incr = re.compile(r"(\s*)(.*)(\+=)(.*$)", re.S)
+  re_decr = re.compile(r"(\s*)(.*)(-=)(.*$)", re.S)
+  re_mult = re.compile(r"(\s*)(.*)(\*=)(.*$)", re.S)
+  re_incr_if = re.compile(r"(.*)(\))(\s*)(.*)(\+=)(.*$)", re.S)
+  re_decr_if = re.compile(r"(.*)(\))(\s*)(.*)(-=)(.*$)", re.S)
+  re_mult_if = re.compile(r"(.*)(\))(\s*)(.*)(\*=)(.*$)", re.S)
   '''Change additional operators'''
   result = []
   for line in text:
@@ -370,17 +373,21 @@ def add_operators(text):
     if ls.startswith('print ') or \
        ls.startswith('print*') or \
        ls.startswith('write('):
-       pass
-    elif "+=" in buffer:
-        if buffer.lstrip().startswith("if "):
-            re_incr = re.compile(r"(.*)(\))(\s*)(.*)(\+=)(.*$)",re.S)
-            line.text = re.sub(re_incr,r'\1\2\4=\4+(\6)', buffer)
-        else:
-            line.text = re.sub(re_incr,r'\1\2=\2+(\4)', buffer)
-    elif "-=" in buffer:
-      line.text = re.sub(re_decr,r'\1\2=\2-(\4)', buffer)
-    elif "*=" in buffer:
-      line.text = re.sub(re_mult,r'\1\2=\2*(\4)', buffer)
+        pass
+    elif buffer.lstrip().startswith("if "):
+        if "+=" in buffer:
+            line.text = re.sub(re_incr_if, r'\1\2\4=\4+(\6)', buffer)
+        elif "-=" in buffer:
+            line.text = re.sub(re_incr_if, r'\1\2\4=\4-(\6)', buffer)
+        elif "*=" in buffer:
+            line.text = re.sub(re_incr_if, r'\1\2\4=\4*(\6)', buffer)
+    else:
+        if "+=" in buffer:
+            line.text = re.sub(re_incr, r'\1\2=\2+(\4)', buffer)
+        elif "-=" in buffer:
+            line.text = re.sub(re_decr, r'\1\2=\2-(\4)', buffer)
+        elif "*=" in buffer:
+            line.text = re.sub(re_mult, r'\1\2=\2*(\4)', buffer)
     result.append(line)
   return result