diff --git a/6/krzywa.rb b/6/krzywa.rb
index 22c10c1..127a662 100755
--- a/6/krzywa.rb
+++ b/6/krzywa.rb
@@ -33,7 +33,7 @@ def generatorKrzywej(p)
   b = 0
 
   while true
-    if primalityTest(p) &&  p % 4 == 3
+    if primalityTest(p) &&  (p % 4 == 3)
       threads = []
 
       threads << Thread.new {
@@ -45,11 +45,13 @@ def generatorKrzywej(p)
       }
 
       ThreadsWait.all_waits(*threads)
-
       if delta(a,b,p) != 0
         returnRownanie(a,b,p)
         return a,b
       end
+    else
+      puts "Liczba nie spełnia wymagań"
+      break
     end
   end
 end
@@ -82,6 +84,12 @@ def punktPrzeciwny(x,y)
 end
 
 def sumaPunktow(a,b,p,x1,y1,x2,y2)
+  # 0 - element neutrany --> P + 0 = P
+  if (x1 == "e" && y1 == "e" )
+    return x2,y2
+  elsif (x2 == "e" && y2 == "e")
+    return x1,y1
+  end
   # P + Q = R
   if (x1 != x2)
     lambda = (((y2 - y1) % p) * reciprocal_Phi_p((x2 - x1),p)) % p
@@ -92,7 +100,7 @@ def sumaPunktow(a,b,p,x1,y1,x2,y2)
   # P + -Q = 0 DZIALA
   if (x1 == x2) && (y1 == -y2)
     puts "0 - el.neutralny"
-    return "0"
+    return e,e
   end
   # P + P = 2P DZIALA
   if (x1 == x2) && (y1 == y2)
@@ -101,12 +109,6 @@ def sumaPunktow(a,b,p,x1,y1,x2,y2)
     y3 = (lambda * (x1 - x3) - y1) % p
     return x3,y3
   end
-  # 0 - element neutrany --> P + 0 = P
-  if (x1 == 0 && y1 == 0 )
-    return x2,y2
-  elsif (x2 == 0 && y2 == 0)
-    return x1,y1
-  end
 end
 
 #puts generatorKrzywej(11).inspect
@@ -148,7 +150,7 @@ yr = 0
 puts punktPrzeciwny(xq,yq).inspect
 
 # 2) R + [0,0]
-puts sumaPunktow(a,b,p,xr,yr,0,0).inspect
+puts sumaPunktow(a,b,p,xr,yr,"e","e").inspect
 
 # 3) P + Q
 puts sumaPunktow(a,b,p,xp,yp,xq,yq).inspect
@@ -195,4 +197,5 @@ qx=q[0].to_i
 qy=q[1].to_i
 r=sumaPunktow(a,b,p,px,py,qx,qy)
 puts "P+Q=R=" + r.inspect
+
 ##################################################